71656864 has 24 divisors (see below), whose sum is σ = 144889668. Its totient is φ = 34859520.

The previous prime is 71656859. The next prime is 71656867. The reversal of 71656864 is 46865617.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 71571600 + 85264 = 8460^2 + 292^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 71656864.

It is not an unprimeable number, because it can be changed into a prime (71656867) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29077 + ... + 31444.

Almost surely, 2^71656864 is an apocalyptic number.

71656864 is a gapful number since it is divisible by the number (74) formed by its first and last digit.

It is an amenable number.

71656864 is an abundant number, since it is smaller than the sum of its proper divisors (73232804).

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

71656864 is a wasteful number, since it uses less digits than its factorization.

71656864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60568 (or 60560 counting only the distinct ones).

The product of its digits is 241920, while the sum is 43.

The square root of 71656864 is about 8465.0377435662. The cubic root of 71656864 is about 415.3548308003.

The spelling of 71656864 in words is "seventy-one million, six hundred fifty-six thousand, eight hundred sixty-four".