87221310 has 64 divisors (see below), whose sum is σ = 230480640. Its totient is φ = 20948480.

The previous prime is 87221287. The next prime is 87221317. The reversal of 87221310 is 1312278.

It is a super-2 number, since 2×87221310² = 15215113836232200, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87221317) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 36121 + ... + 38459.

It is an arithmetic number, because the mean of its divisors is an integer number (3601260).

Almost surely, 2^87221310 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 87221310, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (115240320).

87221310 is an abundant number, since it is smaller than the sum of its proper divisors (143259330).

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

87221310 is a wasteful number, since it uses less digits than its factorization.

87221310 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2473.

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 87221310 is about 9339.2349793760. The cubic root of 87221310 is about 443.4801663116.

Adding to 87221310 its reverse (1312278), we get a palindrome (88533588).

The spelling of 87221310 in words is "eighty-seven million, two hundred twenty-one thousand, three hundred ten".