90238525 has 12 divisors (see below), whose sum is σ = 120503572. Its totient is φ = 66637440.

The previous prime is 90238507. The next prime is 90238529. The reversal of 90238525 is 52583209.

It can be written as a sum of positive squares in 6 ways, for example, as 38081241 + 52157284 = 6171^2 + 7222^2 .

It is not a de Polignac number, because 90238525 - 2⁵ = 90238493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90238529) 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, 138504 + ... + 139153.

Almost surely, 2^90238525 is an apocalyptic number.

It is an amenable number.

90238525 is a deficient number, since it is larger than the sum of its proper divisors (30265047).

90238525 is a wasteful number, since it uses less digits than its factorization.

90238525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277680 (or 277675 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 90238525 is about 9499.3960334329. The cubic root of 90238525 is about 448.5360243362.

The spelling of 90238525 in words is "ninety million, two hundred thirty-eight thousand, five hundred twenty-five".