71640568 has 16 divisors (see below), whose sum is σ = 134556480. Its totient is φ = 35758848.

The previous prime is 71640559. The next prime is 71640581. The reversal of 71640568 is 86504617.

It is a congruent number.

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, 2521 + ... + 12232.

It is an arithmetic number, because the mean of its divisors is an integer number (8409780).

Almost surely, 2^71640568 is an apocalyptic number.

It is an amenable number.

71640568 is a deficient number, since it is larger than the sum of its proper divisors (62915912).

71640568 is a wasteful number, since it uses less digits than its factorization.

71640568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15366 (or 15362 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 71640568 is about 8464.0751414434. The cubic root of 71640568 is about 415.3233421421.

The spelling of 71640568 in words is "seventy-one million, six hundred forty thousand, five hundred sixty-eight".