71656857 has 12 divisors (see below), whose sum is σ = 105259440. Its totient is φ = 46961208.

The previous prime is 71656831. The next prime is 71656859. The reversal of 71656857 is 75865617.

It is not a de Polignac number, because 71656857 - 2⁸ = 71656601 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (71656859) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 66943 + ... + 68004.

It is an arithmetic number, because the mean of its divisors is an integer number (8771620).

Almost surely, 2^71656857 is an apocalyptic number.

It is an amenable number.

71656857 is a deficient number, since it is larger than the sum of its proper divisors (33602583).

71656857 is a wasteful number, since it uses less digits than its factorization.

71656857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135012 (or 135009 counting only the distinct ones).

The product of its digits is 352800, while the sum is 45.

The square root of 71656857 is about 8465.0373301008. The cubic root of 71656857 is about 415.3548172752.

The spelling of 71656857 in words is "seventy-one million, six hundred fifty-six thousand, eight hundred fifty-seven".