78517912 has 16 divisors (see below), whose sum is σ = 160605000. Its totient is φ = 35689920.

The previous prime is 78517897. The next prime is 78517913. The reversal of 78517912 is 21971587.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78517913) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 446037 + ... + 446212.

Almost surely, 2^78517912 is an apocalyptic number.

It is an amenable number.

78517912 is an abundant number, since it is smaller than the sum of its proper divisors (82087088).

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

78517912 is a wasteful number, since it uses less digits than its factorization.

78517912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 892266 (or 892262 counting only the distinct ones).

The product of its digits is 35280, while the sum is 40.

The square root of 78517912 is about 8861.0333483178. The cubic root of 78517912 is about 428.2094499931.

The spelling of 78517912 in words is "seventy-eight million, five hundred seventeen thousand, nine hundred twelve".