87178251 has 24 divisors (see below), whose sum is σ = 124047504. Its totient is φ = 54446400.

The previous prime is 87178249. The next prime is 87178277. The reversal of 87178251 is 15287178.

It is not a de Polignac number, because 87178251 - 2¹ = 87178249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (87178241) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 108985 + ... + 109781.

It is an arithmetic number, because the mean of its divisors is an integer number (5168646).

Almost surely, 2^87178251 is an apocalyptic number.

87178251 is a deficient number, since it is larger than the sum of its proper divisors (36869253).

87178251 is a wasteful number, since it uses less digits than its factorization.

87178251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 939 (or 920 counting only the distinct ones).

The product of its digits is 31360, while the sum is 39.

The square root of 87178251 is about 9336.9294203180. The cubic root of 87178251 is about 443.4071759086.

The spelling of 87178251 in words is "eighty-seven million, one hundred seventy-eight thousand, two hundred fifty-one".