87210621918 has 64 divisors (see below), whose sum is σ = 221528832000. Its totient is φ = 24912647712.

The previous prime is 87210621859. The next prime is 87210621919. The reversal of 87210621918 is 81912601278.

87210621918 is a `hidden beast` number, since 8 + 7 + 2 + 1 + 0 + 621 + 9 + 18 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87210621919) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2336043 + ... + 2373081.

It is an arithmetic number, because the mean of its divisors is an integer number (3461388000).

Almost surely, 2^87210621918 is an apocalyptic number.

87210621918 is an abundant number, since it is smaller than the sum of its proper divisors (134318210082).

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

87210621918 is a wasteful number, since it uses less digits than its factorization.

87210621918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43286 (or 43280 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 45.

The spelling of 87210621918 in words is "eighty-seven billion, two hundred ten million, six hundred twenty-one thousand, nine hundred eighteen".