87210990 has 24 divisors (see below), whose sum is σ = 226748808. Its totient is φ = 23256240.

The previous prime is 87210989. The next prime is 87210997. The reversal of 87210990 is 9901278.

It is a happy number.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87210997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 484416 + ... + 484595.

It is an arithmetic number, because the mean of its divisors is an integer number (9447867).

Almost surely, 2^87210990 is an apocalyptic number.

87210990 is an abundant number, since it is smaller than the sum of its proper divisors (139537818).

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

87210990 is a wasteful number, since it uses less digits than its factorization.

87210990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 969024 (or 969021 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 87210990 is about 9338.6824552503. The cubic root of 87210990 is about 443.4626748070.

The spelling of 87210990 in words is "eighty-seven million, two hundred ten thousand, nine hundred ninety".