71139656 has 32 divisors (see below), whose sum is σ = 153066240. Its totient is φ = 30363648.

The previous prime is 71139631. The next prime is 71139661. The reversal of 71139656 is 65693117.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11921 + ... + 16863.

It is an arithmetic number, because the mean of its divisors is an integer number (4783320).

Almost surely, 2^71139656 is an apocalyptic number.

It is an amenable number.

71139656 is an abundant number, since it is smaller than the sum of its proper divisors (81926584).

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

71139656 is a wasteful number, since it uses less digits than its factorization.

71139656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5213 (or 5209 counting only the distinct ones).

The product of its digits is 34020, while the sum is 38.

The square root of 71139656 is about 8434.4327610101. The cubic root of 71139656 is about 414.3530947989.

The spelling of 71139656 in words is "seventy-one million, one hundred thirty-nine thousand, six hundred fifty-six".