87565971 has 8 divisors (see below), whose sum is σ = 118733760. Its totient is φ = 57387752.

The previous prime is 87565937. The next prime is 87565981. The reversal of 87565971 is 17956578.

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

It is a cyclic number.

It is not a de Polignac number, because 87565971 - 2¹⁵ = 87533203 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 87565971.

It is not an unprimeable number, because it can be changed into a prime (87565901) 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, 247185 + ... + 247538.

It is an arithmetic number, because the mean of its divisors is an integer number (14841720).

Almost surely, 2^87565971 is an apocalyptic number.

87565971 is a deficient number, since it is larger than the sum of its proper divisors (31167789).

87565971 is a wasteful number, since it uses less digits than its factorization.

87565971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 494785.

The product of its digits is 529200, while the sum is 48.

The square root of 87565971 is about 9357.6691007964. The cubic root of 87565971 is about 444.0635460139.

The spelling of 87565971 in words is "eighty-seven million, five hundred sixty-five thousand, nine hundred seventy-one".