71999956 has 12 divisors (see below), whose sum is σ = 143999968. Its totient is φ = 30857112.

The previous prime is 71999909. The next prime is 71999989. The reversal of 71999956 is 65999917.

71999956 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 71999897 and 71999906.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1285686 + ... + 1285741.

Almost surely, 2^71999956 is an apocalyptic number.

It is an amenable number.

71999956 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

71999956 is a wasteful number, since it uses less digits than its factorization.

71999956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2571438 (or 2571436 counting only the distinct ones).

The product of its digits is 1377810, while the sum is 55.

The square root of 71999956 is about 8485.2787815133. The cubic root of 71999956 is about 416.0166798662.

The spelling of 71999956 in words is "seventy-one million, nine hundred ninety-nine thousand, nine hundred fifty-six".