87170399 has 4 divisors (see below), whose sum is σ = 87359136. Its totient is φ = 86981664.

The previous prime is 87170389. The next prime is 87170401. The reversal of 87170399 is 99307178.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87170399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87170359) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93674 + ... + 94599.

It is an arithmetic number, because the mean of its divisors is an integer number (21839784).

Almost surely, 2^87170399 is an apocalyptic number.

87170399 is a deficient number, since it is larger than the sum of its proper divisors (188737).

87170399 is a wasteful number, since it uses less digits than its factorization.

87170399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188736.

The product of its (nonzero) digits is 95256, while the sum is 44.

The square root of 87170399 is about 9336.5089300016. The cubic root of 87170399 is about 443.3938631934.

The spelling of 87170399 in words is "eighty-seven million, one hundred seventy thousand, three hundred ninety-nine".