90792257 has 6 divisors (see below), whose sum is σ = 96174594. Its totient is φ = 85414560.

The previous prime is 90792253. The next prime is 90792263. The reversal of 90792257 is 75229709.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 85451536 + 5340721 = 9244^2 + 2311^2 .

It is not a de Polignac number, because 90792257 - 2² = 90792253 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90792253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 38132 + ... + 40442.

It is an arithmetic number, because the mean of its divisors is an integer number (16029099).

Almost surely, 2^90792257 is an apocalyptic number.

It is an amenable number.

90792257 is a deficient number, since it is larger than the sum of its proper divisors (5382337).

90792257 is an frugal number, since it uses more digits than its factorization.

90792257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4639 (or 2328 counting only the distinct ones).

The product of its (nonzero) digits is 79380, while the sum is 41.

The square root of 90792257 is about 9528.4971008024. The cubic root of 90792257 is about 449.4516068685.

The spelling of 90792257 in words is "ninety million, seven hundred ninety-two thousand, two hundred fifty-seven".