655787 has 4 divisors (see below), whose sum is σ = 715416. Its totient is φ = 596160.

The previous prime is 655757. The next prime is 655807. The reversal of 655787 is 787556.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 655787 - 2⁶ = 655723 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 655787.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 655787.

It is not an unprimeable number, because it can be changed into a prime (655717) 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, 29798 + ... + 29819.

It is an arithmetic number, because the mean of its divisors is an integer number (178854).

2⁶⁵⁵⁷⁸⁷ is an apocalyptic number.

655787 is a deficient number, since it is larger than the sum of its proper divisors (59629).

655787 is a wasteful number, since it uses less digits than its factorization.

655787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59628.

The product of its digits is 58800, while the sum is 38.

The square root of 655787 is about 809.8067670747. The cubic root of 655787 is about 86.8802244844.

Subtracting 655787 from its reverse (787556), we obtain a square (131769 = 363²).

The spelling of 655787 in words is "six hundred fifty-five thousand, seven hundred eighty-seven".