90000012 has 24 divisors (see below), whose sum is σ = 219131136. Its totient is φ = 28695568.

The previous prime is 89999999. The next prime is 90000049. The reversal of 90000012 is 21000009.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 162768 + ... + 163319.

It is an arithmetic number, because the mean of its divisors is an integer number (9130464).

Almost surely, 2^90000012 is an apocalyptic number.

90000012 is a gapful number since it is divisible by the number (92) formed by its first and last digit.

It is an amenable number.

90000012 is an abundant number, since it is smaller than the sum of its proper divisors (129131124).

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

90000012 is a wasteful number, since it uses less digits than its factorization.

90000012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326117 (or 326115 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 12.

The square root of 90000012 is about 9486.8336129606. The cubic root of 90000012 is about 448.1404945731.

The spelling of 90000012 in words is "ninety million, twelve", and thus it is an aban number and an uban number.