90638925 has 36 divisors (see below), whose sum is σ = 162293184. Its totient is φ = 44616000.

The previous prime is 90638923. The next prime is 90638953. The reversal of 90638925 is 52983609.

It is not a de Polignac number, because 90638925 - 2¹ = 90638923 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90638923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 9100 + ... + 16250.

It is an arithmetic number, because the mean of its divisors is an integer number (4508144).

Almost surely, 2^90638925 is an apocalyptic number.

It is an amenable number.

90638925 is a deficient number, since it is larger than the sum of its proper divisors (71654259).

90638925 is a wasteful number, since it uses less digits than its factorization.

90638925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7190 (or 7172 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 42.

The square root of 90638925 is about 9520.4477310681. The cubic root of 90638925 is about 449.1984496510.

It can be divided in two parts, 90 and 638925, that added together give a triangular number (639015 = T₁₁₃₀).

The spelling of 90638925 in words is "ninety million, six hundred thirty-eight thousand, nine hundred twenty-five".