90669257 has 12 divisors (see below), whose sum is σ = 105729300. Its totient is φ = 77527296.

The previous prime is 90669223. The next prime is 90669269. The reversal of 90669257 is 75296609.

It can be written as a sum of positive squares in 2 ways, for example, as 51681721 + 38987536 = 7189^2 + 6244^2 .

It is not a de Polignac number, because 90669257 - 2⁸ = 90669001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90669217) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20369 + ... + 24417.

It is an arithmetic number, because the mean of its divisors is an integer number (8810775).

Almost surely, 2^90669257 is an apocalyptic number.

It is an amenable number.

90669257 is a deficient number, since it is larger than the sum of its proper divisors (15060043).

90669257 is a wasteful number, since it uses less digits than its factorization.

90669257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4520 (or 4513 counting only the distinct ones).

The product of its (nonzero) digits is 204120, while the sum is 44.

The square root of 90669257 is about 9522.0405901256. The cubic root of 90669257 is about 449.2485516272.

The spelling of 90669257 in words is "ninety million, six hundred sixty-nine thousand, two hundred fifty-seven".