87504561 has 12 divisors (see below), whose sum is σ = 128468340. Its totient is φ = 57379680.

The previous prime is 87504551. The next prime is 87504569. The reversal of 87504561 is 16540578.

It can be written as a sum of positive squares in 2 ways, for example, as 38937600 + 48566961 = 6240^2 + 6969^2 .

It is not a de Polignac number, because 87504561 - 2⁶ = 87504497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (87504569) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 79146 + ... + 80243.

It is an arithmetic number, because the mean of its divisors is an integer number (10705695).

Almost surely, 2^87504561 is an apocalyptic number.

It is an amenable number.

87504561 is a deficient number, since it is larger than the sum of its proper divisors (40963779).

87504561 is a wasteful number, since it uses less digits than its factorization.

87504561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159456 (or 159453 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 36.

The square root of 87504561 is about 9354.3872594628. The cubic root of 87504561 is about 443.9597145090.

The spelling of 87504561 in words is "eighty-seven million, five hundred four thousand, five hundred sixty-one".