656635 has 16 divisors (see below), whose sum is σ = 916416. Its totient is φ = 442368.

The previous prime is 656609. The next prime is 656651. The reversal of 656635 is 536656.

It is a happy number.

656635 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a 14-Lehmer number, since φ(656635) divides (656635-1)¹⁴.

It is a cyclic number.

It is not a de Polignac number, because 656635 - 2⁵ = 656603 is a prime.

It is a Duffinian number.

656635 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 656597 and 656606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2427 + ... + 2683.

It is an arithmetic number, because the mean of its divisors is an integer number (57276).

2⁶⁵⁶⁶³⁵ is an apocalyptic number.

656635 is a deficient number, since it is larger than the sum of its proper divisors (259781).

656635 is a wasteful number, since it uses less digits than its factorization.

656635 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342.

The product of its digits is 16200, while the sum is 31.

The square root of 656635 is about 810.3301796182. The cubic root of 656635 is about 86.9176567080.

The spelling of 656635 in words is "six hundred fifty-six thousand, six hundred thirty-five".