77309977 has 2 divisors, whose sum is σ = 77309978. Its totient is φ = 77309976.

The previous prime is 77309963. The next prime is 77309989. The reversal of 77309977 is 77990377.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77158656 + 151321 = 8784^2 + 389^2 .

It is a cyclic number.

It is not a de Polignac number, because 77309977 - 2⁷ = 77309849 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77309977.

It is not a weakly prime, because it can be changed into another prime (77309957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38654988 + 38654989.

It is an arithmetic number, because the mean of its divisors is an integer number (38654989).

Almost surely, 2^77309977 is an apocalyptic number.

It is an amenable number.

77309977 is a deficient number, since it is larger than the sum of its proper divisors (1).

77309977 is an equidigital number, since it uses as much as digits as its factorization.

77309977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 583443, while the sum is 49.

The square root of 77309977 is about 8792.6092259352. The cubic root of 77309977 is about 426.0022059736.

The spelling of 77309977 in words is "seventy-seven million, three hundred nine thousand, nine hundred seventy-seven".