78779980 has 12 divisors (see below), whose sum is σ = 165438000. Its totient is φ = 31511984.

The previous prime is 78779977. The next prime is 78780001. The reversal of 78779980 is 8997787.

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, 1969480 + ... + 1969519.

It is an arithmetic number, because the mean of its divisors is an integer number (13786500).

Almost surely, 2^78779980 is an apocalyptic number.

It is an amenable number.

78779980 is an abundant number, since it is smaller than the sum of its proper divisors (86658020).

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

78779980 is a wasteful number, since it uses less digits than its factorization.

78779980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3939008 (or 3939006 counting only the distinct ones).

The product of its (nonzero) digits is 1778112, while the sum is 55.

The square root of 78779980 is about 8875.8086955499. The cubic root of 78779980 is about 428.6853302547.

The spelling of 78779980 in words is "seventy-eight million, seven hundred seventy-nine thousand, nine hundred eighty".