656630 has 16 divisors (see below), whose sum is σ = 1273104. Its totient is φ = 242400.

The previous prime is 656609. The next prime is 656651. The reversal of 656630 is 36656.

It is an interprime number because it is at equal distance from previous prime (656609) and next prime (656651).

It is a Harshad number since it is a multiple of its sum of digits (26).

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 656630.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2396 + ... + 2655.

It is an arithmetic number, because the mean of its divisors is an integer number (79569).

2⁶⁵⁶⁶³⁰ is an apocalyptic number.

656630 is a deficient number, since it is larger than the sum of its proper divisors (616474).

656630 is a wasteful number, since it uses less digits than its factorization.

656630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5071.

The product of its (nonzero) digits is 3240, while the sum is 26.

The square root of 656630 is about 810.3270944501. The cubic root of 656630 is about 86.9174360936.

Adding to 656630 its sum of digits (26), we get a palindrome (656656).

The spelling of 656630 in words is "six hundred fifty-six thousand, six hundred thirty".