78931512 has 48 divisors (see below), whose sum is σ = 233209080. Its totient is φ = 23918400.

The previous prime is 78931511. The next prime is 78931543. The reversal of 78931512 is 21513987.

It is a super-2 number, since 2×78931512² = 12460367173212288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78931511) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 49039 + ... + 50622.

Almost surely, 2^78931512 is an apocalyptic number.

78931512 is a gapful number since it is divisible by the number (72) formed by its first and last digit.

It is an amenable number.

78931512 is an abundant number, since it is smaller than the sum of its proper divisors (154277568).

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

78931512 is a wasteful number, since it uses less digits than its factorization.

78931512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99684 (or 99677 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 78931512 is about 8884.3408309227. The cubic root of 78931512 is about 428.9600106171.

The spelling of 78931512 in words is "seventy-eight million, nine hundred thirty-one thousand, five hundred twelve".