77527979 has 2 divisors, whose sum is σ = 77527980. Its totient is φ = 77527978.

The previous prime is 77527969. The next prime is 77528023. The reversal of 77527979 is 97972577.

It is a weak prime.

It is an emirp because it is prime and its reverse (97972577) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77527979 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77527979.

It is not a weakly prime, because it can be changed into another prime (77527969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38763989 + 38763990.

It is an arithmetic number, because the mean of its divisors is an integer number (38763990).

Almost surely, 2^77527979 is an apocalyptic number.

77527979 is a deficient number, since it is larger than the sum of its proper divisors (1).

77527979 is an equidigital number, since it uses as much as digits as its factorization.

77527979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1944810, while the sum is 53.

The square root of 77527979 is about 8804.9973878474. The cubic root of 77527979 is about 426.4022499726.

The spelling of 77527979 in words is "seventy-seven million, five hundred twenty-seven thousand, nine hundred seventy-nine".