87251904 has 70 divisors (see below), whose sum is σ = 258657344. Its totient is φ = 29082240.

The previous prime is 87251897. The next prime is 87251909. The reversal of 87251904 is 40915278.

It is a super-2 number, since 2×87251904² = 15225789503250432, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87251909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 3232 + ... + 13599.

Almost surely, 2^87251904 is an apocalyptic number.

It is an amenable number.

87251904 is an abundant number, since it is smaller than the sum of its proper divisors (171405440).

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

87251904 is a wasteful number, since it uses less digits than its factorization.

87251904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16855 (or 16836 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 87251904 is about 9340.8727643620. The cubic root of 87251904 is about 443.5320123806.

The spelling of 87251904 in words is "eighty-seven million, two hundred fifty-one thousand, nine hundred four".