90561888 has 60 divisors (see below), whose sum is σ = 266347620. Its totient is φ = 30186432.

The previous prime is 90561871. The next prime is 90561893. The reversal of 90561888 is 88816509.

90561888 is a `hidden beast` number, since 9 + 0 + 561 + 8 + 88 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 14878 + ... + 20061.

It is an arithmetic number, because the mean of its divisors is an integer number (4439127).

Almost surely, 2^90561888 is an apocalyptic number.

It is an amenable number.

90561888 is an abundant number, since it is smaller than the sum of its proper divisors (175785732).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

90561888 is a wasteful number, since it uses less digits than its factorization.

90561888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34961 (or 34944 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 45.

The square root of 90561888 is about 9516.4010003782. The cubic root of 90561888 is about 449.0711507392.

The spelling of 90561888 in words is "ninety million, five hundred sixty-one thousand, eight hundred eighty-eight".