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70100640 = 25365601

70100640 has 168 divisors, whose sum is σ = 248718708. Its totient is φ = 18662400.

The previous prime is 70100603. The next prime is 70100647. The reversal of 70100640 is 4600107.

It can be written as a sum of positive squares in 2 ways, for example, as 69155856 + 944784 = 8316^2 + 972^2 .

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70100647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 116340 + ... + 116940.

Almost surely, 270100640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 70100640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (124359354).

70100640 is an abundant number, since it is smaller than the sum of its proper divisors (178618068).

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

70100640 is an equidigital number, since it uses as much as digits as its factorization.

70100640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 634 (or 611 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 70100640 is about 8372.6124955118. The cubic root of 70100640 is about 412.3259430949.

Adding to 70100640 its reverse (4600107), we get a palindrome (74700747).

The spelling of 70100640 in words is "seventy million, one hundred thousand, six hundred forty".