77712977 has 2 divisors, whose sum is σ = 77712978. Its totient is φ = 77712976.

The previous prime is 77712961. The next prime is 77712989. The reversal of 77712977 is 77921777.

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., 40246336 + 37466641 = 6344^2 + 6121^2 .

It is a cyclic number.

It is not a de Polignac number, because 77712977 - 2⁴ = 77712961 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (77712277) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38856488 + 38856489.

It is an arithmetic number, because the mean of its divisors is an integer number (38856489).

Almost surely, 2^77712977 is an apocalyptic number.

It is an amenable number.

77712977 is a deficient number, since it is larger than the sum of its proper divisors (1).

77712977 is an equidigital number, since it uses as much as digits as its factorization.

77712977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 302526, while the sum is 47.

The square root of 77712977 is about 8815.4964125680. The cubic root of 77712977 is about 426.7411422592.

The spelling of 77712977 in words is "seventy-seven million, seven hundred twelve thousand, nine hundred seventy-seven".