77387979 has 24 divisors (see below), whose sum is σ = 109885360. Its totient is φ = 48408192.

The previous prime is 77387977. The next prime is 77387987. The reversal of 77387979 is 97978377.

It is not a de Polignac number, because 77387979 - 2¹ = 77387977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77387977) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 92937 + ... + 93765.

Almost surely, 2^77387979 is an apocalyptic number.

77387979 is a deficient number, since it is larger than the sum of its proper divisors (32497381).

77387979 is a wasteful number, since it uses less digits than its factorization.

77387979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 927 (or 898 counting only the distinct ones).

The product of its digits is 4667544, while the sum is 57.

The square root of 77387979 is about 8797.0437648110. The cubic root of 77387979 is about 426.1454296390.

The spelling of 77387979 in words is "seventy-seven million, three hundred eighty-seven thousand, nine hundred seventy-nine".