78979930 has 16 divisors (see below), whose sum is σ = 148345344. Its totient is φ = 30218320.

The previous prime is 78979921. The next prime is 78979951. The reversal of 78979930 is 3997987.

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 7 ways as a sum of consecutive naturals, for example, 171466 + ... + 171925.

It is an arithmetic number, because the mean of its divisors is an integer number (9271584).

Almost surely, 2^78979930 is an apocalyptic number.

78979930 is a deficient number, since it is larger than the sum of its proper divisors (69365414).

78979930 is a wasteful number, since it uses less digits than its factorization.

78979930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343421.

The product of its (nonzero) digits is 857304, while the sum is 52.

The square root of 78979930 is about 8887.0653198905. The cubic root of 78979930 is about 429.0477032676.

The spelling of 78979930 in words is "seventy-eight million, nine hundred seventy-nine thousand, nine hundred thirty".