87198917 has 8 divisors (see below), whose sum is σ = 93990624. Its totient is φ = 80419248.

The previous prime is 87198913. The next prime is 87198919. The reversal of 87198917 is 71989178.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 87198917 - 2² = 87198913 is a prime.

It is a super-2 number, since 2×87198917² = 15207302251945778, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87198913) 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, 17018 + ... + 21540.

It is an arithmetic number, because the mean of its divisors is an integer number (11748828).

Almost surely, 2^87198917 is an apocalyptic number.

It is an amenable number.

87198917 is a deficient number, since it is larger than the sum of its proper divisors (6791707).

87198917 is a wasteful number, since it uses less digits than its factorization.

87198917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6019.

The product of its digits is 254016, while the sum is 50.

The square root of 87198917 is about 9338.0360354841. The cubic root of 87198917 is about 443.4422103681.

The spelling of 87198917 in words is "eighty-seven million, one hundred ninety-eight thousand, nine hundred seventeen".