90981892 has 12 divisors (see below), whose sum is σ = 168584220. Its totient is φ = 42814976.

The previous prime is 90981887. The next prime is 90981893. The reversal of 90981892 is 29818909.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 57062916 + 33918976 = 7554^2 + 5824^2 .

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (90981893) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 668917 + ... + 669052.

It is an arithmetic number, because the mean of its divisors is an integer number (14048685).

Almost surely, 2^90981892 is an apocalyptic number.

It is an amenable number.

90981892 is a deficient number, since it is larger than the sum of its proper divisors (77602328).

90981892 is a wasteful number, since it uses less digits than its factorization.

90981892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1337990 (or 1337988 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 46.

The square root of 90981892 is about 9538.4428498576. The cubic root of 90981892 is about 449.7643078511.

The spelling of 90981892 in words is "ninety million, nine hundred eighty-one thousand, eight hundred ninety-two".