78746979 has 4 divisors (see below), whose sum is σ = 104995976. Its totient is φ = 52497984.

The previous prime is 78746959. The next prime is 78747047. The reversal of 78746979 is 97964787.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 78746979 - 2⁹ = 78746467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78746939) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 13124494 + ... + 13124499.

It is an arithmetic number, because the mean of its divisors is an integer number (26248994).

Almost surely, 2^78746979 is an apocalyptic number.

78746979 is a deficient number, since it is larger than the sum of its proper divisors (26248997).

78746979 is a wasteful number, since it uses less digits than its factorization.

78746979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26248996.

The product of its digits is 5334336, while the sum is 57.

The square root of 78746979 is about 8873.9494589501. The cubic root of 78746979 is about 428.6254630124.

The spelling of 78746979 in words is "seventy-eight million, seven hundred forty-six thousand, nine hundred seventy-nine".