90642225 has 24 divisors (see below), whose sum is σ = 151677792. Its totient is φ = 47756800.

The previous prime is 90642203. The next prime is 90642229. The reversal of 90642225 is 52224609.

It is not a de Polignac number, because 90642225 - 2¹¹ = 90640177 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 90642192 and 90642201.

It is not an unprimeable number, because it can be changed into a prime (90642229) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1056 + ... + 13505.

It is an arithmetic number, because the mean of its divisors is an integer number (6319908).

Almost surely, 2^90642225 is an apocalyptic number.

It is an amenable number.

90642225 is a deficient number, since it is larger than the sum of its proper divisors (61035567).

90642225 is a wasteful number, since it uses less digits than its factorization.

90642225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14657 (or 14652 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 90642225 is about 9520.6210406675. The cubic root of 90642225 is about 449.2039010870.

The spelling of 90642225 in words is "ninety million, six hundred forty-two thousand, two hundred twenty-five".