71857856 has 28 divisors (see below), whose sum is σ = 162964368. Its totient is φ = 30796032.

The previous prime is 71857843. The next prime is 71857879. The reversal of 71857856 is 65875817.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (28).

It is a self number, because there is not a number n which added to its sum of digits gives 71857856.

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, 79751 + ... + 80646.

It is an arithmetic number, because the mean of its divisors is an integer number (5820156).

Almost surely, 2^71857856 is an apocalyptic number.

It is an amenable number.

71857856 is an abundant number, since it is smaller than the sum of its proper divisors (91106512).

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

71857856 is a wasteful number, since it uses less digits than its factorization.

71857856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160416 (or 160406 counting only the distinct ones).

The product of its digits is 470400, while the sum is 47.

The square root of 71857856 is about 8476.9013206478. The cubic root of 71857856 is about 415.7428144045.

The spelling of 71857856 in words is "seventy-one million, eight hundred fifty-seven thousand, eight hundred fifty-six".