87919885 has 4 divisors (see below), whose sum is σ = 105503868. Its totient is φ = 70335904.

The previous prime is 87919883. The next prime is 87919891. The reversal of 87919885 is 58891978.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 57471561 + 30448324 = 7581^2 + 5518^2 .

It is a cyclic number.

It is not a de Polignac number, because 87919885 - 2¹ = 87919883 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 (87919883) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8791984 + ... + 8791993.

It is an arithmetic number, because the mean of its divisors is an integer number (26375967).

Almost surely, 2^87919885 is an apocalyptic number.

It is an amenable number.

87919885 is a deficient number, since it is larger than the sum of its proper divisors (17583983).

87919885 is a wasteful number, since it uses less digits than its factorization.

87919885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17583982.

The product of its digits is 1451520, while the sum is 55.

The square root of 87919885 is about 9376.5604034742. The cubic root of 87919885 is about 444.6609967032.

It can be divided in two parts, 87919 and 885, that added together give a square (88804 = 298²).

The spelling of 87919885 in words is "eighty-seven million, nine hundred nineteen thousand, eight hundred eighty-five".