90724452025 has 27 divisors (see below), whose sum is σ = 113761595311. Its totient is φ = 71773537040.

The previous prime is 90724452023. The next prime is 90724452047. The reversal of 90724452025 is 52025442709.

The square root of 90724452025 is 301205.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 32660802729 + 58063649296 = 180723^2 + 240964^2 .

It is not a de Polignac number, because 90724452025 - 2¹ = 90724452023 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90724452023) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 161144394 + ... + 161144956.

Almost surely, 2^90724452025 is an apocalyptic number.

90724452025 is the 301205-th square number.

90724452025 is the 150603-rd centered octagonal number.

It is an amenable number.

90724452025 is a deficient number, since it is larger than the sum of its proper divisors (23037143286).

90724452025 is an frugal number, since it uses more digits than its factorization.

90724452025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1350 (or 675 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 40.

The spelling of 90724452025 in words is "ninety billion, seven hundred twenty-four million, four hundred fifty-two thousand, twenty-five".