90302257 has 8 divisors (see below), whose sum is σ = 91808640. Its totient is φ = 88806000.

The previous prime is 90302243. The next prime is 90302297. The reversal of 90302257 is 75220309.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 90302257 - 2⁷ = 90302129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90302227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16632 + ... + 21382.

It is an arithmetic number, because the mean of its divisors is an integer number (11476080).

Almost surely, 2^90302257 is an apocalyptic number.

It is an amenable number.

90302257 is a deficient number, since it is larger than the sum of its proper divisors (1506383).

90302257 is a wasteful number, since it uses less digits than its factorization.

90302257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5063.

The product of its (nonzero) digits is 3780, while the sum is 28.

The square root of 90302257 is about 9502.7499704033. The cubic root of 90302257 is about 448.6415940685.

The spelling of 90302257 in words is "ninety million, three hundred two thousand, two hundred fifty-seven".