656705 has 16 divisors (see below), whose sum is σ = 933120. Its totient is φ = 434112.

The previous prime is 656701. The next prime is 656707. The reversal of 656705 is 507656.

It is not a de Polignac number, because 656705 - 2² = 656701 is a prime.

It is a super-2 number, since 2×656705² = 862522914050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (29).

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 (656701) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 692 + ... + 1338.

It is an arithmetic number, because the mean of its divisors is an integer number (58320).

2⁶⁵⁶⁷⁰⁵ is an apocalyptic number.

It is an amenable number.

656705 is a deficient number, since it is larger than the sum of its proper divisors (276415).

656705 is a wasteful number, since it uses less digits than its factorization.

656705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 688.

The product of its (nonzero) digits is 6300, while the sum is 29.

The square root of 656705 is about 810.3733707372. The cubic root of 656705 is about 86.9207451919.

The spelling of 656705 in words is "six hundred fifty-six thousand, seven hundred five".