87512805 has 64 divisors (see below), whose sum is σ = 161533440. Its totient is φ = 45489600.

The previous prime is 87512801. The next prime is 87512809. The reversal of 87512805 is 50821578.

It is an interprime number because it is at equal distance from previous prime (87512801) and next prime (87512809).

It is not a de Polignac number, because 87512805 - 2² = 87512801 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 87512805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87512801) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 579480 + ... + 579630.

It is an arithmetic number, because the mean of its divisors is an integer number (2523960).

Almost surely, 2^87512805 is an apocalyptic number.

It is an amenable number.

87512805 is a deficient number, since it is larger than the sum of its proper divisors (74020635).

87512805 is an equidigital number, since it uses as much as digits as its factorization.

87512805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230 (or 212 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 36.

The square root of 87512805 is about 9354.8278979359. The cubic root of 87512805 is about 443.9736562164.

The spelling of 87512805 in words is "eighty-seven million, five hundred twelve thousand, eight hundred five".