87185808 has 50 divisors (see below), whose sum is σ = 252344774. Its totient is φ = 29061504.

The previous prime is 87185807. The next prime is 87185867. The reversal of 87185808 is 80858178.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 58798224 + 28387584 = 7668^2 + 5328^2 .

It is a super-2 number, since 2×87185808² = 15202730233225728, which contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (87185807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 32341 + ... + 34932.

Almost surely, 2^87185808 is an apocalyptic number.

It is an amenable number.

87185808 is an abundant number, since it is smaller than the sum of its proper divisors (165158966).

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

87185808 is a wasteful number, since it uses less digits than its factorization.

87185808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67293 (or 67278 counting only the distinct ones).

The product of its (nonzero) digits is 143360, while the sum is 45.

The square root of 87185808 is about 9337.3340949117. The cubic root of 87185808 is about 443.4199877096.

The spelling of 87185808 in words is "eighty-seven million, one hundred eighty-five thousand, eight hundred eight".