656747 has 12 divisors (see below), whose sum is σ = 823536. Its totient is φ = 519120.

The previous prime is 656741. The next prime is 656749. The reversal of 656747 is 747656.

It is not a de Polignac number, because 656747 - 2⁶ = 656683 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (656741) 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, 122 + ... + 1152.

It is an arithmetic number, because the mean of its divisors is an integer number (68628).

2⁶⁵⁶⁷⁴⁷ is an apocalyptic number.

656747 is a deficient number, since it is larger than the sum of its proper divisors (166789).

656747 is a wasteful number, since it uses less digits than its factorization.

656747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1058 (or 1051 counting only the distinct ones).

The product of its digits is 35280, while the sum is 35.

The square root of 656747 is about 810.3992843037. The cubic root of 656747 is about 86.9225981768.

Subtracting 656747 from its reverse (747656), we obtain a palindrome (90909).

The spelling of 656747 in words is "six hundred fifty-six thousand, seven hundred forty-seven".