87278531 has 8 divisors (see below), whose sum is σ = 87919104. Its totient is φ = 86640840.

The previous prime is 87278501. The next prime is 87278539. The reversal of 87278531 is 13587278.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 87278531 - 2⁶ = 87278467 is a prime.

It is a super-2 number, since 2×87278531² = 15235083947035922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87278539) 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, 119690 + ... + 120416.

It is an arithmetic number, because the mean of its divisors is an integer number (10989888).

Almost surely, 2^87278531 is an apocalyptic number.

87278531 is a deficient number, since it is larger than the sum of its proper divisors (640573).

87278531 is a wasteful number, since it uses less digits than its factorization.

87278531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1441.

The product of its digits is 94080, while the sum is 41.

The square root of 87278531 is about 9342.2979507185. The cubic root of 87278531 is about 443.5771259166.

The spelling of 87278531 in words is "eighty-seven million, two hundred seventy-eight thousand, five hundred thirty-one".