87537321 has 16 divisors (see below), whose sum is σ = 129830400. Its totient is φ = 58292784.

The previous prime is 87537319. The next prime is 87537323. The reversal of 87537321 is 12373578.

It is an interprime number because it is at equal distance from previous prime (87537319) and next prime (87537323).

It is not a de Polignac number, because 87537321 - 2¹ = 87537319 is a prime.

It is not an unprimeable number, because it can be changed into a prime (87537323) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41275 + ... + 43343.

It is an arithmetic number, because the mean of its divisors is an integer number (8114400).

Almost surely, 2^87537321 is an apocalyptic number.

It is an amenable number.

87537321 is a deficient number, since it is larger than the sum of its proper divisors (42293079).

87537321 is a wasteful number, since it uses less digits than its factorization.

87537321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3645 (or 3639 counting only the distinct ones).

The product of its digits is 35280, while the sum is 36.

The square root of 87537321 is about 9356.1381456240. The cubic root of 87537321 is about 444.0151108809.

The spelling of 87537321 in words is "eighty-seven million, five hundred thirty-seven thousand, three hundred twenty-one".