87616557 has 36 divisors (see below), whose sum is σ = 149679036. Its totient is φ = 49230720.

The previous prime is 87616537. The next prime is 87616559. The reversal of 87616557 is 75561678.

87616557 is a `hidden beast` number, since 87 + 6 + 16 + 557 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 34821801 + 52794756 = 5901^2 + 7266^2 .

It is not a de Polignac number, because 87616557 - 2⁶ = 87616493 is a prime.

It is a super-2 number, since 2×87616557² = 15353322121068498, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87616559) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 25273 + ... + 28529.

It is an arithmetic number, because the mean of its divisors is an integer number (4157751).

Almost surely, 2^87616557 is an apocalyptic number.

It is an amenable number.

87616557 is a deficient number, since it is larger than the sum of its proper divisors (62062479).

87616557 is a wasteful number, since it uses less digits than its factorization.

87616557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3338 (or 3328 counting only the distinct ones).

The product of its digits is 352800, while the sum is 45.

The square root of 87616557 is about 9360.3716272379. The cubic root of 87616557 is about 444.1490399337.

The spelling of 87616557 in words is "eighty-seven million, six hundred sixteen thousand, five hundred fifty-seven".