87107917 has 4 divisors (see below), whose sum is σ = 93808540. Its totient is φ = 80407296.

The previous prime is 87107899. The next prime is 87107921. The reversal of 87107917 is 71970178.

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

It can be written as a sum of positive squares in 2 ways, for example, as 38303721 + 48804196 = 6189^2 + 6986^2 .

It is a cyclic number.

It is not a de Polignac number, because 87107917 - 2²³ = 78719309 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 87107917.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87107947) 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, 3350292 + ... + 3350317.

It is an arithmetic number, because the mean of its divisors is an integer number (23452135).

Almost surely, 2^87107917 is an apocalyptic number.

It is an amenable number.

87107917 is a deficient number, since it is larger than the sum of its proper divisors (6700623).

87107917 is a wasteful number, since it uses less digits than its factorization.

87107917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6700622.

The product of its (nonzero) digits is 24696, while the sum is 40.

The square root of 87107917 is about 9333.1622186695. The cubic root of 87107917 is about 443.2878992516.

The spelling of 87107917 in words is "eighty-seven million, one hundred seven thousand, nine hundred seventeen".