87221910 has 32 divisors (see below), whose sum is σ = 216087552. Its totient is φ = 22508640.

The previous prime is 87221903. The next prime is 87221921. The reversal of 87221910 is 1912278.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

It is a congruent number.

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, 45964 + ... + 47823.

It is an arithmetic number, because the mean of its divisors is an integer number (6752736).

Almost surely, 2^87221910 is an apocalyptic number.

87221910 is an abundant number, since it is smaller than the sum of its proper divisors (128865642).

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

87221910 is a wasteful number, since it uses less digits than its factorization.

87221910 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93828.

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 87221910 is about 9339.2671018662. The cubic root of 87221910 is about 443.4811832171.

The spelling of 87221910 in words is "eighty-seven million, two hundred twenty-one thousand, nine hundred ten".