87387531 has 72 divisors (see below), whose sum is σ = 158291280. Its totient is φ = 42725760.

The previous prime is 87387499. The next prime is 87387539. The reversal of 87387531 is 13578378.

It is not a de Polignac number, because 87387531 - 2⁵ = 87387499 is a prime.

It is a super-3 number, since 3×87387531³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

Its product of digits (141120) is a multiple of the sum of its prime factors (90).

It is not an unprimeable number, because it can be changed into a prime (87387539) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 5140435 + ... + 5140451.

It is an arithmetic number, because the mean of its divisors is an integer number (2198490).

Almost surely, 2^87387531 is an apocalyptic number.

87387531 is a deficient number, since it is larger than the sum of its proper divisors (70903749).

87387531 is a wasteful number, since it uses less digits than its factorization.

87387531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90 (or 38 counting only the distinct ones).

The product of its digits is 141120, while the sum is 42.

The square root of 87387531 is about 9348.1298129626. The cubic root of 87387531 is about 443.7617066012.

The spelling of 87387531 in words is "eighty-seven million, three hundred eighty-seven thousand, five hundred thirty-one".