87987565 has 8 divisors (see below), whose sum is σ = 106356600. Its totient is φ = 69875712.

The previous prime is 87987547. The next prime is 87987569. The reversal of 87987565 is 56578978.

It can be written as a sum of positive squares in 4 ways, for example, as 11634921 + 76352644 = 3411^2 + 8738^2 .

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 87987565 - 2⁵ = 87987533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87987569) 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, 63540 + ... + 64909.

It is an arithmetic number, because the mean of its divisors is an integer number (13294575).

Almost surely, 2^87987565 is an apocalyptic number.

It is an amenable number.

87987565 is a deficient number, since it is larger than the sum of its proper divisors (18369035).

87987565 is a wasteful number, since it uses less digits than its factorization.

87987565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128591.

The product of its digits is 4233600, while the sum is 55.

The square root of 87987565 is about 9380.1687085041. The cubic root of 87987565 is about 444.7750662236.

The spelling of 87987565 in words is "eighty-seven million, nine hundred eighty-seven thousand, five hundred sixty-five".