87221500 has 24 divisors (see below), whose sum is σ = 190492848. Its totient is φ = 34888400.

The previous prime is 87221489. The next prime is 87221539. The reversal of 87221500 is 512278.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86722 + ... + 87721.

It is an arithmetic number, because the mean of its divisors is an integer number (7937202).

Almost surely, 2^87221500 is an apocalyptic number.

It is an amenable number.

87221500 is an abundant number, since it is smaller than the sum of its proper divisors (103271348).

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

87221500 is a wasteful number, since it uses less digits than its factorization.

87221500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174462 (or 174450 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 87221500 is about 9339.2451515098. The cubic root of 87221500 is about 443.4804883322.

Adding to 87221500 its reverse (512278), we get a palindrome (87733778).

The spelling of 87221500 in words is "eighty-seven million, two hundred twenty-one thousand, five hundred".