87515785 has 32 divisors (see below), whose sum is σ = 123206400. Its totient is φ = 58440960.

The previous prime is 87515783. The next prime is 87515801. The reversal of 87515785 is 58751578.

It is a happy number.

It is not a de Polignac number, because 87515785 - 2¹ = 87515783 is a prime.

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 31 ways as a sum of consecutive naturals, for example, 382051 + ... + 382279.

It is an arithmetic number, because the mean of its divisors is an integer number (3850200).

Almost surely, 2^87515785 is an apocalyptic number.

It is an amenable number.

87515785 is a deficient number, since it is larger than the sum of its proper divisors (35690615).

87515785 is a wasteful number, since it uses less digits than its factorization.

87515785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 481.

The product of its digits is 392000, while the sum is 46.

The square root of 87515785 is about 9354.9871726262. The cubic root of 87515785 is about 443.9786955798.

The spelling of 87515785 in words is "eighty-seven million, five hundred fifteen thousand, seven hundred eighty-five".