90213188 has 12 divisors (see below), whose sum is σ = 170017260. Its totient is φ = 41636832.

The previous prime is 90213157. The next prime is 90213191. The reversal of 90213188 is 88131209.

It can be written as a sum of positive squares in 2 ways, for example, as 53465344 + 36747844 = 7312^2 + 6062^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 867383 + ... + 867486.

It is an arithmetic number, because the mean of its divisors is an integer number (14168105).

Almost surely, 2^90213188 is an apocalyptic number.

It is an amenable number.

90213188 is a deficient number, since it is larger than the sum of its proper divisors (79804072).

90213188 is a wasteful number, since it uses less digits than its factorization.

90213188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1734886 (or 1734884 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 90213188 is about 9498.0623287068. The cubic root of 90213188 is about 448.4940407116.

The spelling of 90213188 in words is "ninety million, two hundred thirteen thousand, one hundred eighty-eight".