87205504 has 16 divisors (see below), whose sum is σ = 173729970. Its totient is φ = 43602688.

The previous prime is 87205487. The next prime is 87205507. The reversal of 87205504 is 40550278.

It can be written as a sum of positive squares in only one way, i.e., 85377600 + 1827904 = 9240^2 + 1352^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (87205507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340519 + ... + 340774.

Almost surely, 2^87205504 is an apocalyptic number.

It is an amenable number.

87205504 is a deficient number, since it is larger than the sum of its proper divisors (86524466).

87205504 is an equidigital number, since it uses as much as digits as its factorization.

87205504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 681307 (or 681295 counting only the distinct ones).

The product of its (nonzero) digits is 11200, while the sum is 31.

The square root of 87205504 is about 9338.3887261133. The cubic root of 87205504 is about 443.4533759513.

The spelling of 87205504 in words is "eighty-seven million, two hundred five thousand, five hundred four".