77867979 has 16 divisors (see below), whose sum is σ = 121551360. Its totient is φ = 43410240.

The previous prime is 77867957. The next prime is 77868013. The reversal of 77867979 is 97976877.

It is not a de Polignac number, because 77867979 - 2¹⁶ = 77802443 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77865979) 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 15 ways as a sum of consecutive naturals, for example, 44359 + ... + 46080.

It is an arithmetic number, because the mean of its divisors is an integer number (7596960).

Almost surely, 2^77867979 is an apocalyptic number.

77867979 is a deficient number, since it is larger than the sum of its proper divisors (43683381).

77867979 is a wasteful number, since it uses less digits than its factorization.

77867979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90490.

The product of its digits is 9335088, while the sum is 60.

The square root of 77867979 is about 8824.2834836603. The cubic root of 77867979 is about 427.0246719213.

The spelling of 77867979 in words is "seventy-seven million, eight hundred sixty-seven thousand, nine hundred seventy-nine".