71556864 has 72 divisors (see below), whose sum is σ = 198774912. Its totient is φ = 22809600.

The previous prime is 71556829. The next prime is 71556883. The reversal of 71556864 is 46865517.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15639 + ... + 19689.

Almost surely, 2^71556864 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 71556864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99387456).

71556864 is an abundant number, since it is smaller than the sum of its proper divisors (127218048).

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

71556864 is a wasteful number, since it uses less digits than its factorization.

71556864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4093 (or 4079 counting only the distinct ones).

The product of its digits is 201600, while the sum is 42.

The square root of 71556864 is about 8459.1290331807. The cubic root of 71556864 is about 415.1615261293.

The spelling of 71556864 in words is "seventy-one million, five hundred fifty-six thousand, eight hundred sixty-four".