90557428 has 24 divisors (see below), whose sum is σ = 173469800. Its totient is φ = 41109120.

The previous prime is 90557393. The next prime is 90557431. The reversal of 90557428 is 82475509.

It can be written as a sum of positive squares in 4 ways, for example, as 6615184 + 83942244 = 2572^2 + 9162^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11103 + ... + 17446.

Almost surely, 2^90557428 is an apocalyptic number.

It is an amenable number.

90557428 is a deficient number, since it is larger than the sum of its proper divisors (82912372).

90557428 is a wasteful number, since it uses less digits than its factorization.

90557428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28627 (or 28625 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 40.

The square root of 90557428 is about 9516.1666652072. The cubic root of 90557428 is about 449.0637786528.

The spelling of 90557428 in words is "ninety million, five hundred fifty-seven thousand, four hundred twenty-eight".