87905869 has 4 divisors (see below), whose sum is σ = 87977500. Its totient is φ = 87834240.

The previous prime is 87905843. The next prime is 87905879. The reversal of 87905869 is 96850978.

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 31505769 + 56400100 = 5613^2 + 7510^2 .

It is a cyclic number.

It is not a de Polignac number, because 87905869 - 2⁹ = 87905357 is a prime.

It is a super-2 number, since 2×87905869² = 15454883609290322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87905879) 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, 33942 + ... + 36439.

It is an arithmetic number, because the mean of its divisors is an integer number (21994375).

Almost surely, 2^87905869 is an apocalyptic number.

It is an amenable number.

87905869 is a deficient number, since it is larger than the sum of its proper divisors (71631).

87905869 is a wasteful number, since it uses less digits than its factorization.

87905869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71630.

The product of its (nonzero) digits is 1088640, while the sum is 52.

The square root of 87905869 is about 9375.8129780836. The cubic root of 87905869 is about 444.6373664791.

The spelling of 87905869 in words is "eighty-seven million, nine hundred five thousand, eight hundred sixty-nine".