78981812 has 36 divisors (see below), whose sum is σ = 171059616. Its totient is φ = 31243680.

The previous prime is 78981797. The next prime is 78981821. The reversal of 78981812 is 21818987.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3614 + ... + 13077.

It is an arithmetic number, because the mean of its divisors is an integer number (4751656).

Almost surely, 2^78981812 is an apocalyptic number.

It is an amenable number.

78981812 is an abundant number, since it is smaller than the sum of its proper divisors (92077804).

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

78981812 is a wasteful number, since it uses less digits than its factorization.

78981812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16728 (or 16713 counting only the distinct ones).

The product of its digits is 64512, while the sum is 44.

The square root of 78981812 is about 8887.1712034820. The cubic root of 78981812 is about 429.0511111433.

The spelling of 78981812 in words is "seventy-eight million, nine hundred eighty-one thousand, eight hundred twelve".