71991264 has 24 divisors (see below), whose sum is σ = 188977320. Its totient is φ = 23997056.

The previous prime is 71991239. The next prime is 71991281. The reversal of 71991264 is 46219917.

It is a tau number, because it is divible by the number of its divisors (24).

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, 374859 + ... + 375050.

It is an arithmetic number, because the mean of its divisors is an integer number (7874055).

Almost surely, 2^71991264 is an apocalyptic number.

It is an amenable number.

71991264 is an abundant number, since it is smaller than the sum of its proper divisors (116986056).

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

71991264 is a wasteful number, since it uses less digits than its factorization.

71991264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 749922 (or 749914 counting only the distinct ones).

The product of its digits is 27216, while the sum is 39.

The square root of 71991264 is about 8484.7665848861. The cubic root of 71991264 is about 415.9999383629. Note that the first 4 decimals are identical.

The spelling of 71991264 in words is "seventy-one million, nine hundred ninety-one thousand, two hundred sixty-four".