87989869 has 6 divisors (see below), whose sum is σ = 96716270. Its totient is φ = 79990680.

The previous prime is 87989851. The next prime is 87989879. The reversal of 87989869 is 96898978.

It can be written as a sum of positive squares in only one way, i.e., 85784644 + 2205225 = 9262^2 + 1485^2 .

It is not a de Polignac number, because 87989869 - 2¹⁵ = 87957101 is a prime.

It is a super-2 number, since 2×87989869² = 15484434093274322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 87989869.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87989809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 363474 + ... + 363715.

Almost surely, 2^87989869 is an apocalyptic number.

It is an amenable number.

87989869 is a deficient number, since it is larger than the sum of its proper divisors (8726401).

87989869 is a wasteful number, since it uses less digits than its factorization.

87989869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 727211 (or 727200 counting only the distinct ones).

The product of its digits is 15676416, while the sum is 64.

The square root of 87989869 is about 9380.2915199902. The cubic root of 87989869 is about 444.7789484116.

The spelling of 87989869 in words is "eighty-seven million, nine hundred eighty-nine thousand, eight hundred sixty-nine".