87704521 has 2 divisors, whose sum is σ = 87704522. Its totient is φ = 87704520.

The previous prime is 87704509. The next prime is 87704567. The reversal of 87704521 is 12540778.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87703225 + 1296 = 9365^2 + 36^2 .

It is a cyclic number.

It is not a de Polignac number, because 87704521 - 2²³ = 79315913 is a prime.

It is not a weakly prime, because it can be changed into another prime (87704501) 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 as a sum of consecutive naturals, namely, 43852260 + 43852261.

It is an arithmetic number, because the mean of its divisors is an integer number (43852261).

Almost surely, 2^87704521 is an apocalyptic number.

It is an amenable number.

87704521 is a deficient number, since it is larger than the sum of its proper divisors (1).

87704521 is an equidigital number, since it uses as much as digits as its factorization.

87704521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15680, while the sum is 34.

The square root of 87704521 is about 9365.0691935511. The cubic root of 87704521 is about 444.2976269896.

The spelling of 87704521 in words is "eighty-seven million, seven hundred four thousand, five hundred twenty-one".