87321880 has 32 divisors (see below), whose sum is σ = 198223200. Its totient is φ = 34617856.

The previous prime is 87321851. The next prime is 87321881. The reversal of 87321880 is 8812378.

It is a super-2 number, since 2×87321880² = 15250221453468800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87321881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5140 + ... + 14179.

It is an arithmetic number, because the mean of its divisors is an integer number (6194475).

Almost surely, 2^87321880 is an apocalyptic number.

It is an amenable number.

87321880 is an abundant number, since it is smaller than the sum of its proper divisors (110901320).

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

87321880 is a wasteful number, since it uses less digits than its factorization.

87321880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19443 (or 19439 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 37.

The square root of 87321880 is about 9344.6177021856. The cubic root of 87321880 is about 443.6505515423.

The spelling of 87321880 in words is "eighty-seven million, three hundred twenty-one thousand, eight hundred eighty".