87317957 has 4 divisors (see below), whose sum is σ = 87393696. Its totient is φ = 87242220.

The previous prime is 87317953. The next prime is 87317969. The reversal of 87317957 is 75971378.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 87317957 - 2² = 87317953 is a prime.

It is a super-2 number, since 2×87317957² = 15248851229307698, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87317953) 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, 36113 + ... + 38454.

It is an arithmetic number, because the mean of its divisors is an integer number (21848424).

Almost surely, 2^87317957 is an apocalyptic number.

It is an amenable number.

87317957 is a deficient number, since it is larger than the sum of its proper divisors (75739).

87317957 is a wasteful number, since it uses less digits than its factorization.

87317957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75738.

The product of its digits is 370440, while the sum is 47.

The square root of 87317957 is about 9344.4077928995. The cubic root of 87317957 is about 443.6439076665.

The spelling of 87317957 in words is "eighty-seven million, three hundred seventeen thousand, nine hundred fifty-seven".