87222990 has 32 divisors (see below), whose sum is σ = 214443936. Its totient is φ = 22691840.

The previous prime is 87222983. The next prime is 87222997. The reversal of 87222990 is 9922278.

It is an interprime number because it is at equal distance from previous prime (87222983) and next prime (87222997).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87222997) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34227 + ... + 36686.

It is an arithmetic number, because the mean of its divisors is an integer number (6701373).

Almost surely, 2^87222990 is an apocalyptic number.

87222990 is an abundant number, since it is smaller than the sum of its proper divisors (127220946).

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

87222990 is a wasteful number, since it uses less digits than its factorization.

87222990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70964.

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 87222990 is about 9339.3249220701. The cubic root of 87222990 is about 443.4830136353.

The spelling of 87222990 in words is "eighty-seven million, two hundred twenty-two thousand, nine hundred ninety".