77508997 has 2 divisors, whose sum is σ = 77508998. Its totient is φ = 77508996.

The previous prime is 77508953. The next prime is 77509007. The reversal of 77508997 is 79980577.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74407876 + 3101121 = 8626^2 + 1761^2 .

It is a cyclic number.

It is not a de Polignac number, because 77508997 - 2¹⁵ = 77476229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77508947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38754498 + 38754499.

It is an arithmetic number, because the mean of its divisors is an integer number (38754499).

Almost surely, 2^77508997 is an apocalyptic number.

It is an amenable number.

77508997 is a deficient number, since it is larger than the sum of its proper divisors (1).

77508997 is an equidigital number, since it uses as much as digits as its factorization.

77508997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1111320, while the sum is 52.

The square root of 77508997 is about 8803.9194112622. The cubic root of 77508997 is about 426.3674469321.

The spelling of 77508997 in words is "seventy-seven million, five hundred eight thousand, nine hundred ninety-seven".