78912816 has 40 divisors (see below), whose sum is σ = 212724480. Its totient is φ = 25160256.

The previous prime is 78912803. The next prime is 78912851. The reversal of 78912816 is 61821987.

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 7 ways as a sum of consecutive naturals, for example, 34636 + ... + 36843.

It is an arithmetic number, because the mean of its divisors is an integer number (5318112).

Almost surely, 2^78912816 is an apocalyptic number.

It is an amenable number.

78912816 is an abundant number, since it is smaller than the sum of its proper divisors (133811664).

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

78912816 is a wasteful number, since it uses less digits than its factorization.

78912816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71513 (or 71507 counting only the distinct ones).

The product of its digits is 48384, while the sum is 42.

The square root of 78912816 is about 8883.2885802500. The cubic root of 78912816 is about 428.9261396090.

The spelling of 78912816 in words is "seventy-eight million, nine hundred twelve thousand, eight hundred sixteen".