90212812 has 12 divisors (see below), whose sum is σ = 167159160. Its totient is φ = 42453056.

The previous prime is 90212809. The next prime is 90212819. The reversal of 90212812 is 21821209.

It is not an unprimeable number, because it can be changed into a prime (90212819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 663262 + ... + 663397.

It is an arithmetic number, because the mean of its divisors is an integer number (13929930).

Almost surely, 2^90212812 is an apocalyptic number.

It is an amenable number.

90212812 is a deficient number, since it is larger than the sum of its proper divisors (76946348).

90212812 is a wasteful number, since it uses less digits than its factorization.

90212812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1326680 (or 1326678 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 90212812 is about 9498.0425351753. The cubic root of 90212812 is about 448.4934176173.

The spelling of 90212812 in words is "ninety million, two hundred twelve thousand, eight hundred twelve".