71515864 has 16 divisors (see below), whose sum is σ = 153248400. Its totient is φ = 30649632.

The previous prime is 71515841. The next prime is 71515879. The reversal of 71515864 is 46851517.

It is a super-2 number, since 2×71515864² = 10229037607332992, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 638479 + ... + 638590.

It is an arithmetic number, because the mean of its divisors is an integer number (9578025).

Almost surely, 2^71515864 is an apocalyptic number.

It is an amenable number.

71515864 is an abundant number, since it is smaller than the sum of its proper divisors (81732536).

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

71515864 is a wasteful number, since it uses less digits than its factorization.

71515864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1277082 (or 1277078 counting only the distinct ones).

The product of its digits is 33600, while the sum is 37.

The square root of 71515864 is about 8456.7052686020. The cubic root of 71515864 is about 415.0822191576.

The spelling of 71515864 in words is "seventy-one million, five hundred fifteen thousand, eight hundred sixty-four".