90615257 has 4 divisors (see below), whose sum is σ = 93064356. Its totient is φ = 88166160.

The previous prime is 90615229. The next prime is 90615293. The reversal of 90615257 is 75251609.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 58079641 + 32535616 = 7621^2 + 5704^2 .

It is a cyclic number.

It is not a de Polignac number, because 90615257 - 2²⁴ = 73838041 is a prime.

It is a super-2 number, since 2×90615257² = 16422249602352098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90615157) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1224494 + ... + 1224567.

It is an arithmetic number, because the mean of its divisors is an integer number (23266089).

Almost surely, 2^90615257 is an apocalyptic number.

It is an amenable number.

90615257 is a deficient number, since it is larger than the sum of its proper divisors (2449099).

90615257 is a wasteful number, since it uses less digits than its factorization.

90615257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2449098.

The product of its (nonzero) digits is 18900, while the sum is 35.

The square root of 90615257 is about 9519.2046411452. The cubic root of 90615257 is about 449.1593474131.

The spelling of 90615257 in words is "ninety million, six hundred fifteen thousand, two hundred fifty-seven".