90405612 has 48 divisors (see below), whose sum is σ = 255696000. Its totient is φ = 27395280.

The previous prime is 90405611. The next prime is 90405619. The reversal of 90405612 is 21650409.

90405612 is a `hidden beast` number, since 9 + 0 + 40 + 5 + 612 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (90405611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36862 + ... + 39237.

It is an arithmetic number, because the mean of its divisors is an integer number (5327000).

Almost surely, 2^90405612 is an apocalyptic number.

It is an amenable number.

90405612 is an abundant number, since it is smaller than the sum of its proper divisors (165290388).

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

90405612 is a wasteful number, since it uses less digits than its factorization.

90405612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76123 (or 76115 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 90405612 is about 9508.1865778917. The cubic root of 90405612 is about 448.8126923117.

The spelling of 90405612 in words is "ninety million, four hundred five thousand, six hundred twelve".