71520656 has 20 divisors (see below), whose sum is σ = 138722892. Its totient is φ = 35721216.

The previous prime is 71520637. The next prime is 71520661. The reversal of 71520656 is 65602517.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 12845056 + 58675600 = 3584^2 + 7660^2 .

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

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, 17636 + ... + 21308.

Almost surely, 2^71520656 is an apocalyptic number.

It is an amenable number.

71520656 is a deficient number, since it is larger than the sum of its proper divisors (67202236).

71520656 is a wasteful number, since it uses less digits than its factorization.

71520656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4898 (or 4892 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 71520656 is about 8456.9885893266. The cubic root of 71520656 is about 415.0914899658.

The spelling of 71520656 in words is "seventy-one million, five hundred twenty thousand, six hundred fifty-six".