90111312 has 40 divisors (see below), whose sum is σ = 258654080. Its totient is φ = 30036960.

The previous prime is 90111299. The next prime is 90111313. The reversal of 90111312 is 21311109.

It is a super-2 number, since 2×90111312² = 16240097100722688, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90111313) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 103864 + ... + 104727.

It is an arithmetic number, because the mean of its divisors is an integer number (6466352).

Almost surely, 2^90111312 is an apocalyptic number.

It is an amenable number.

90111312 is an abundant number, since it is smaller than the sum of its proper divisors (168542768).

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

90111312 is a wasteful number, since it uses less digits than its factorization.

90111312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208608 (or 208596 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 18.

The square root of 90111312 is about 9492.6978251707. The cubic root of 90111312 is about 448.3251519200.

The spelling of 90111312 in words is "ninety million, one hundred eleven thousand, three hundred twelve".