77979983 has 2 divisors, whose sum is σ = 77979984. Its totient is φ = 77979982.

The previous prime is 77979947. The next prime is 77980033. The reversal of 77979983 is 38997977.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 77979983 - 2⁶ = 77979919 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77979943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38989991 + 38989992.

It is an arithmetic number, because the mean of its divisors is an integer number (38989992).

Almost surely, 2^77979983 is an apocalyptic number.

77979983 is a deficient number, since it is larger than the sum of its proper divisors (1).

77979983 is an equidigital number, since it uses as much as digits as its factorization.

77979983 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6001128, while the sum is 59.

The square root of 77979983 is about 8830.6275541436. The cubic root of 77979983 is about 427.2293155518.

The spelling of 77979983 in words is "seventy-seven million, nine hundred seventy-nine thousand, nine hundred eighty-three".