78912920 has 16 divisors (see below), whose sum is σ = 177554160. Its totient is φ = 31565152.

The previous prime is 78912917. The next prime is 78912943. The reversal of 78912920 is 2921987.

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, 986372 + ... + 986451.

It is an arithmetic number, because the mean of its divisors is an integer number (11097135).

Almost surely, 2^78912920 is an apocalyptic number.

It is an amenable number.

78912920 is an abundant number, since it is smaller than the sum of its proper divisors (98641240).

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

78912920 is a wasteful number, since it uses less digits than its factorization.

78912920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1972834 (or 1972830 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 78912920 is about 8883.2944339361. The cubic root of 78912920 is about 428.9263280377.

The spelling of 78912920 in words is "seventy-eight million, nine hundred twelve thousand, nine hundred twenty".