87557917 has 4 divisors (see below), whose sum is σ = 87617376. Its totient is φ = 87498460.

The previous prime is 87557881. The next prime is 87557927. The reversal of 87557917 is 71975578.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 87557917 - 2¹⁵ = 87525149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87557927) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27463 + ... + 30484.

It is an arithmetic number, because the mean of its divisors is an integer number (21904344).

Almost surely, 2^87557917 is an apocalyptic number.

It is an amenable number.

87557917 is a deficient number, since it is larger than the sum of its proper divisors (59459).

87557917 is a wasteful number, since it uses less digits than its factorization.

87557917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59458.

The product of its digits is 617400, while the sum is 49.

The square root of 87557917 is about 9357.2387486908. The cubic root of 87557917 is about 444.0499311457.

The spelling of 87557917 in words is "eighty-seven million, five hundred fifty-seven thousand, nine hundred seventeen".