87220722 has 32 divisors (see below), whose sum is σ = 178967232. Its totient is φ = 28327104.

The previous prime is 87220711. The next prime is 87220759. The reversal of 87220722 is 22702278.

It is a self number, because there is not a number n which added to its sum of digits gives 87220722.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49053 + ... + 50799.

It is an arithmetic number, because the mean of its divisors is an integer number (5592726).

Almost surely, 2^87220722 is an apocalyptic number.

87220722 is an abundant number, since it is smaller than the sum of its proper divisors (91746510).

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

87220722 is a wasteful number, since it uses less digits than its factorization.

87220722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1962.

The product of its (nonzero) digits is 6272, while the sum is 30.

The square root of 87220722 is about 9339.2034992284. The cubic root of 87220722 is about 443.4791697397.

The spelling of 87220722 in words is "eighty-seven million, two hundred twenty thousand, seven hundred twenty-two".