90790657 has 2 divisors, whose sum is σ = 90790658. Its totient is φ = 90790656.

The previous prime is 90790633. The next prime is 90790669. The reversal of 90790657 is 75609709.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62157456 + 28633201 = 7884^2 + 5351^2 .

It is a cyclic number.

It is not a de Polignac number, because 90790657 - 2⁷ = 90790529 is a prime.

It is not a weakly prime, because it can be changed into another prime (90790697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45395328 + 45395329.

It is an arithmetic number, because the mean of its divisors is an integer number (45395329).

Almost surely, 2^90790657 is an apocalyptic number.

It is an amenable number.

90790657 is a deficient number, since it is larger than the sum of its proper divisors (1).

90790657 is an equidigital number, since it uses as much as digits as its factorization.

90790657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 119070, while the sum is 43.

The square root of 90790657 is about 9528.4131417566. The cubic root of 90790657 is about 449.4489666772.

The spelling of 90790657 in words is "ninety million, seven hundred ninety thousand, six hundred fifty-seven".