78905980 has 12 divisors (see below), whose sum is σ = 165702600. Its totient is φ = 31562384.

The previous prime is 78905977. The next prime is 78905999. The reversal of 78905980 is 8950987.

It is a self number, because there is not a number n which added to its sum of digits gives 78905980.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 1972630 + ... + 1972669.

It is an arithmetic number, because the mean of its divisors is an integer number (13808550).

Almost surely, 2^78905980 is an apocalyptic number.

It is an amenable number.

78905980 is an abundant number, since it is smaller than the sum of its proper divisors (86796620).

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

78905980 is a wasteful number, since it uses less digits than its factorization.

78905980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3945308 (or 3945306 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 46.

The square root of 78905980 is about 8882.9038045000. The cubic root of 78905980 is about 428.9137536878.

The spelling of 78905980 in words is "seventy-eight million, nine hundred five thousand, nine hundred eighty".