87187799 has 4 divisors (see below), whose sum is σ = 89544264. Its totient is φ = 84831336.

The previous prime is 87187783. The next prime is 87187811. The reversal of 87187799 is 99778178.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99778178 = 2 ⋅49889089.

It is a cyclic number.

It is not a de Polignac number, because 87187799 - 2⁴ = 87187783 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87187729) 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 3 ways as a sum of consecutive naturals, for example, 1178177 + ... + 1178250.

It is an arithmetic number, because the mean of its divisors is an integer number (22386066).

Almost surely, 2^87187799 is an apocalyptic number.

87187799 is a deficient number, since it is larger than the sum of its proper divisors (2356465).

87187799 is a wasteful number, since it uses less digits than its factorization.

87187799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2356464.

The product of its digits is 1778112, while the sum is 56.

The square root of 87187799 is about 9337.4407093164. The cubic root of 87187799 is about 443.4233630390.

The spelling of 87187799 in words is "eighty-seven million, one hundred eighty-seven thousand, seven hundred ninety-nine".