87515786 has 24 divisors (see below), whose sum is σ = 141549120. Its totient is φ = 40557096.

The previous prime is 87515783. The next prime is 87515801. The reversal of 87515786 is 68751578.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 87515786.

It is not an unprimeable number, because it can be changed into a prime (87515783) 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 11 ways as a sum of consecutive naturals, for example, 32645 + ... + 35223.

It is an arithmetic number, because the mean of its divisors is an integer number (5897880).

Almost surely, 2^87515786 is an apocalyptic number.

87515786 is a deficient number, since it is larger than the sum of its proper divisors (54033334).

87515786 is a wasteful number, since it uses less digits than its factorization.

87515786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2666 (or 2647 counting only the distinct ones).

The product of its digits is 470400, while the sum is 47.

The square root of 87515786 is about 9354.9872260736. The cubic root of 87515786 is about 443.9786972708.

It can be divided in two parts, 875 and 15786, that added together give a palindrome (16661).

The spelling of 87515786 in words is "eighty-seven million, five hundred fifteen thousand, seven hundred eighty-six".