70897664 has 52 divisors (see below), whose sum is σ = 149403840. Its totient is φ = 33546240.

The previous prime is 70897597. The next prime is 70897691. The reversal of 70897664 is 46679807.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77369 + ... + 78279.

Almost surely, 2^70897664 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 70897664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74701920).

70897664 is an abundant number, since it is smaller than the sum of its proper divisors (78506176).

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

70897664 is an equidigital number, since it uses as much as digits as its factorization.

70897664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 954 (or 932 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 47.

The square root of 70897664 is about 8420.0750590479. The cubic root of 70897664 is about 413.8827334016.

The spelling of 70897664 in words is "seventy million, eight hundred ninety-seven thousand, six hundred sixty-four".