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70020720 = 24335711421
BaseRepresentation
bin1000010110001…
…10111001110000
311212202102101000
410023012321300
5120411130340
610540442000
71510111020
oct413067160
9155672330
1070020720
1136585670
121b549300
13116780a3
149429a80
156231d30
hex42c6e70

70020720 has 320 divisors, whose sum is σ = 301409280. Its totient is φ = 14515200.

The previous prime is 70020701. The next prime is 70020721. The reversal of 70020720 is 2702007.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is a junction number, because it is equal to n+sod(n) for n = 70020693 and 70020702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70020721) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 166110 + ... + 166530.

It is an arithmetic number, because the mean of its divisors is an integer number (941904).

Almost surely, 270020720 is an apocalyptic number.

70020720 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 70020720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (150704640).

70020720 is an abundant number, since it is smaller than the sum of its proper divisors (231388560).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

70020720 is a wasteful number, since it uses less digits than its factorization.

70020720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 461 (or 449 counting only the distinct ones).

The product of its (nonzero) digits is 196, while the sum is 18.

The square root of 70020720 is about 8367.8384305626. The cubic root of 70020720 is about 412.1691893177.

Adding to 70020720 its reverse (2702007), we get a palindrome (72722727).

The spelling of 70020720 in words is "seventy million, twenty thousand, seven hundred twenty".