87517998 has 48 divisors (see below), whose sum is σ = 197121600. Its totient is φ = 28029120.

The previous prime is 87517979. The next prime is 87518051. The reversal of 87517998 is 89971578.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 202843 + ... + 203273.

It is an arithmetic number, because the mean of its divisors is an integer number (4106700).

Almost surely, 2^87517998 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 87517998, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98560800).

87517998 is an abundant number, since it is smaller than the sum of its proper divisors (109603602).

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

87517998 is a wasteful number, since it uses less digits than its factorization.

87517998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 857 (or 854 counting only the distinct ones).

The product of its digits is 1270080, while the sum is 54.

The square root of 87517998 is about 9355.1054510358. The cubic root of 87517998 is about 443.9824378249.

The spelling of 87517998 in words is "eighty-seven million, five hundred seventeen thousand, nine hundred ninety-eight".