87218940 has 48 divisors (see below), whose sum is σ = 247570848. Its totient is φ = 22938624.

The previous prime is 87218927. The next prime is 87218951. The reversal of 87218940 is 4981278.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5577 + ... + 14336.

It is an arithmetic number, because the mean of its divisors is an integer number (5157726).

Almost surely, 2^87218940 is an apocalyptic number.

It is an amenable number.

87218940 is an abundant number, since it is smaller than the sum of its proper divisors (160351908).

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

87218940 is a wasteful number, since it uses less digits than its factorization.

87218940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19998 (or 19996 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 87218940 is about 9339.1080944596. The cubic root of 87218940 is about 443.4761494893.

The spelling of 87218940 in words is "eighty-seven million, two hundred eighteen thousand, nine hundred forty".