77974979 has 4 divisors (see below), whose sum is σ = 78006984. Its totient is φ = 77942976.

The previous prime is 77974957. The next prime is 77975011. The reversal of 77974979 is 97947977.

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

It is a cyclic number.

It is not a de Polignac number, because 77974979 - 2¹² = 77970883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77974909) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12017 + ... + 17330.

It is an arithmetic number, because the mean of its divisors is an integer number (19501746).

Almost surely, 2^77974979 is an apocalyptic number.

77974979 is a deficient number, since it is larger than the sum of its proper divisors (32005).

77974979 is a wasteful number, since it uses less digits than its factorization.

77974979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32004.

The product of its digits is 7001316, while the sum is 59.

The square root of 77974979 is about 8830.3442175263. The cubic root of 77974979 is about 427.2201768766.

The spelling of 77974979 in words is "seventy-seven million, nine hundred seventy-four thousand, nine hundred seventy-nine".