87855918 has 16 divisors (see below), whose sum is σ = 177268176. Its totient is φ = 29025920.

The previous prime is 87855917. The next prime is 87855941. The reversal of 87855918 is 81955878.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87855917) 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, 64113 + ... + 65468.

It is an arithmetic number, because the mean of its divisors is an integer number (11079261).

Almost surely, 2^87855918 is an apocalyptic number.

87855918 is an abundant number, since it is smaller than the sum of its proper divisors (89412258).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

87855918 is a wasteful number, since it uses less digits than its factorization.

87855918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129699.

The product of its digits is 806400, while the sum is 51.

The square root of 87855918 is about 9373.1487772253. The cubic root of 87855918 is about 444.5531313402.

The spelling of 87855918 in words is "eighty-seven million, eight hundred fifty-five thousand, nine hundred eighteen".