78711956 has 12 divisors (see below), whose sum is σ = 139294260. Its totient is φ = 38913600.

The previous prime is 78711931. The next prime is 78711979. The reversal of 78711956 is 65911787.

It can be written as a sum of positive squares in 2 ways, for example, as 9821956 + 68890000 = 3134^2 + 8300^2 .

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, 110195 + ... + 110906.

It is an arithmetic number, because the mean of its divisors is an integer number (11607855).

Almost surely, 2^78711956 is an apocalyptic number.

It is an amenable number.

78711956 is a deficient number, since it is larger than the sum of its proper divisors (60582304).

78711956 is a wasteful number, since it uses less digits than its factorization.

78711956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221194 (or 221192 counting only the distinct ones).

The product of its digits is 105840, while the sum is 44.

The square root of 78711956 is about 8871.9758791376. The cubic root of 78711956 is about 428.5619093547.

The spelling of 78711956 in words is "seventy-eight million, seven hundred eleven thousand, nine hundred fifty-six".