70671720 has 256 divisors, whose sum is σ = 264384000. Its totient is φ = 15052800.

The previous prime is 70671677. The next prime is 70671721. The reversal of 70671720 is 2717607.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (70671721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 699670 + ... + 699770.

It is an arithmetic number, because the mean of its divisors is an integer number (1032750).

Almost surely, 2^70671720 is an apocalyptic number.

70671720 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 70671720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (132192000).

70671720 is an abundant number, since it is smaller than the sum of its proper divisors (193712280).

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

70671720 is a wasteful number, since it uses less digits than its factorization.

70671720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153 (or 135 counting only the distinct ones).

The product of its (nonzero) digits is 4116, while the sum is 30.

The square root of 70671720 is about 8406.6473697902. The cubic root of 70671720 is about 413.4425974288.

The spelling of 70671720 in words is "seventy million, six hundred seventy-one thousand, seven hundred twenty".