87918644 has 24 divisors (see below), whose sum is σ = 168184128. Its totient is φ = 39882240.

The previous prime is 87918631. The next prime is 87918647. The reversal of 87918644 is 44681978.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87918647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23657 + ... + 27119.

It is an arithmetic number, because the mean of its divisors is an integer number (7007672).

Almost surely, 2^87918644 is an apocalyptic number.

It is an amenable number.

87918644 is a deficient number, since it is larger than the sum of its proper divisors (80265484).

87918644 is a wasteful number, since it uses less digits than its factorization.

87918644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4055 (or 4053 counting only the distinct ones).

The product of its digits is 387072, while the sum is 47.

The square root of 87918644 is about 9376.4942275885. The cubic root of 87918644 is about 444.6589045451.

The spelling of 87918644 in words is "eighty-seven million, nine hundred eighteen thousand, six hundred forty-four".