77707979 has 8 divisors (see below), whose sum is σ = 80329728. Its totient is φ = 75093480.

The previous prime is 77707963. The next prime is 77707999. The reversal of 77707979 is 97970777.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 77707979 - 2⁴ = 77707963 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 77707979.

It is not an unprimeable number, because it can be changed into a prime (77707919) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28034 + ... + 30680.

It is an arithmetic number, because the mean of its divisors is an integer number (10041216).

Almost surely, 2^77707979 is an apocalyptic number.

77707979 is a deficient number, since it is larger than the sum of its proper divisors (2621749).

77707979 is a wasteful number, since it uses less digits than its factorization.

77707979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3625.

The product of its (nonzero) digits is 1361367, while the sum is 53.

The square root of 77707979 is about 8815.2129299297. The cubic root of 77707979 is about 426.7319936458.

The spelling of 77707979 in words is "seventy-seven million, seven hundred seven thousand, nine hundred seventy-nine".