987657 has 12 divisors (see below), whose sum is σ = 1444944. Its totient is φ = 595120.

The previous prime is 987631. The next prime is 987659. The reversal of 987657 is 756789.

It is not a de Polignac number, because 987657 - 2⁶ = 987593 is a prime.

Its product of digits (105840) is a multiple of the sum of its prime factors (360).

It is not an unprimeable number, because it can be changed into a prime (987659) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5623 + ... + 5795.

It is an arithmetic number, because the mean of its divisors is an integer number (120412).

2⁹⁸⁷⁶⁵⁷ is an apocalyptic number.

It is an amenable number.

987657 is a deficient number, since it is larger than the sum of its proper divisors (457287).

987657 is a wasteful number, since it uses less digits than its factorization.

987657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360 (or 187 counting only the distinct ones).

The product of its digits is 105840, while the sum is 42.

The square root of 987657 is about 993.8093378511. The cubic root of 987657 is about 99.5868621887.

The spelling of 987657 in words is "nine hundred eighty-seven thousand, six hundred fifty-seven".