71287664 has 40 divisors (see below), whose sum is σ = 167141088. Its totient is φ = 28753920.

The previous prime is 71287663. The next prime is 71287669. The reversal of 71287664 is 46678217.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71287663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16817 + ... + 20624.

Almost surely, 2^71287664 is an apocalyptic number.

It is an amenable number.

71287664 is an abundant number, since it is smaller than the sum of its proper divisors (95853424).

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

71287664 is a wasteful number, since it uses less digits than its factorization.

71287664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37473 (or 37467 counting only the distinct ones).

The product of its digits is 112896, while the sum is 41.

The square root of 71287664 is about 8443.2022361187. The cubic root of 71287664 is about 414.6402533926.

The spelling of 71287664 in words is "seventy-one million, two hundred eighty-seven thousand, six hundred sixty-four".