87557913 has 12 divisors (see below), whose sum is σ = 127323300. Its totient is φ = 57979296.

The previous prime is 87557881. The next prime is 87557927. The reversal of 87557913 is 31975578.

87557913 is a `hidden beast` number, since 8 + 7 + 557 + 91 + 3 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 26904969 + 60652944 = 5187^2 + 7788^2 .

It is not a de Polignac number, because 87557913 - 2⁵ = 87557881 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (87557963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31306 + ... + 33987.

It is an arithmetic number, because the mean of its divisors is an integer number (10610275).

Almost surely, 2^87557913 is an apocalyptic number.

It is an amenable number.

87557913 is a deficient number, since it is larger than the sum of its proper divisors (39765387).

87557913 is a wasteful number, since it uses less digits than its factorization.

87557913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65448 (or 65445 counting only the distinct ones).

The product of its digits is 264600, while the sum is 45.

The square root of 87557913 is about 9357.2385349525. The cubic root of 87557913 is about 444.0499243837.

The spelling of 87557913 in words is "eighty-seven million, five hundred fifty-seven thousand, nine hundred thirteen".