77990317 has 2 divisors, whose sum is σ = 77990318. Its totient is φ = 77990316.

The previous prime is 77990299. The next prime is 77990321. The reversal of 77990317 is 71309977.

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., 48080356 + 29909961 = 6934^2 + 5469^2 .

It is a cyclic number.

It is not a de Polignac number, because 77990317 - 2¹⁹ = 77466029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77990357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38995158 + 38995159.

It is an arithmetic number, because the mean of its divisors is an integer number (38995159).

Almost surely, 2^77990317 is an apocalyptic number.

It is an amenable number.

77990317 is a deficient number, since it is larger than the sum of its proper divisors (1).

77990317 is an equidigital number, since it uses as much as digits as its factorization.

77990317 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 83349, while the sum is 43.

The square root of 77990317 is about 8831.2126573874. The cubic root of 77990317 is about 427.2481870304.

The spelling of 77990317 in words is "seventy-seven million, nine hundred ninety thousand, three hundred seventeen".