90558612 has 18 divisors (see below), whose sum is σ = 228912138. Its totient is φ = 30186192.

The previous prime is 90558599. The next prime is 90558623. The reversal of 90558612 is 21685509.

It is a happy number.

90558612 is a `hidden beast` number, since 90 + 558 + 6 + 12 = 666.

It can be written as a sum of positive squares in only one way, i.e., 90554256 + 4356 = 9516^2 + 66^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 2515517 = 90558612 / (9 + 0 + 5 + 5 + 8 + 6 + 1 + 2).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1257723 + ... + 1257794.

It is an arithmetic number, because the mean of its divisors is an integer number (12717341).

Almost surely, 2^90558612 is an apocalyptic number.

It is an amenable number.

90558612 is an abundant number, since it is smaller than the sum of its proper divisors (138353526).

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

90558612 is a wasteful number, since it uses less digits than its factorization.

90558612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2515527 (or 2515522 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 36.

The square root of 90558612 is about 9516.2288749273. The cubic root of 90558612 is about 449.0657357504.

The spelling of 90558612 in words is "ninety million, five hundred fifty-eight thousand, six hundred twelve".