87015563 has 4 divisors (see below), whose sum is σ = 87041640. Its totient is φ = 86989488.

The previous prime is 87015547. The next prime is 87015581. The reversal of 87015563 is 36551078.

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

It is a cyclic number.

It is not a de Polignac number, because 87015563 - 2⁴ = 87015547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87015583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7145 + ... + 15002.

It is an arithmetic number, because the mean of its divisors is an integer number (21760410).

Almost surely, 2^87015563 is an apocalyptic number.

87015563 is a deficient number, since it is larger than the sum of its proper divisors (26077).

87015563 is a wasteful number, since it uses less digits than its factorization.

87015563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26076.

The product of its (nonzero) digits is 25200, while the sum is 35.

The square root of 87015563 is about 9328.2132801518. The cubic root of 87015563 is about 443.1311822010.

It can be divided in two parts, 87015 and 563, that added together give a palindrome (87578).

The spelling of 87015563 in words is "eighty-seven million, fifteen thousand, five hundred sixty-three".