87404557 has 2 divisors, whose sum is σ = 87404558. Its totient is φ = 87404556.

The previous prime is 87404543. The next prime is 87404563. The reversal of 87404557 is 75540478.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 86471401 + 933156 = 9299^2 + 966^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87404557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87404507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43702278 + 43702279.

It is an arithmetic number, because the mean of its divisors is an integer number (43702279).

Almost surely, 2^87404557 is an apocalyptic number.

It is an amenable number.

87404557 is a deficient number, since it is larger than the sum of its proper divisors (1).

87404557 is an equidigital number, since it uses as much as digits as its factorization.

87404557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 156800, while the sum is 40.

The square root of 87404557 is about 9349.0404320443. The cubic root of 87404557 is about 443.7905245805.

The spelling of 87404557 in words is "eighty-seven million, four hundred four thousand, five hundred fifty-seven".