656672 has 12 divisors (see below), whose sum is σ = 1292886. Its totient is φ = 328320.

The previous prime is 656671. The next prime is 656681. The reversal of 656672 is 276656.

It can be written as a sum of positive squares in only one way, i.e., 524176 + 132496 = 724^2 + 364^2 .

It is a Harshad number since it is a multiple of its sum of digits (32), and also a Moran number because the ratio is a prime number: 20521 = 656672 / (6 + 5 + 6 + 6 + 7 + 2).

It is not an unprimeable number, because it can be changed into a prime (656671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10229 + ... + 10292.

2⁶⁵⁶⁶⁷² is an apocalyptic number.

It is an amenable number.

656672 is a deficient number, since it is larger than the sum of its proper divisors (636214).

656672 is a wasteful number, since it uses less digits than its factorization.

656672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20531 (or 20523 counting only the distinct ones).

The product of its digits is 15120, while the sum is 32.

The square root of 656672 is about 810.3530094965. The cubic root of 656672 is about 86.9192892197.

The spelling of 656672 in words is "six hundred fifty-six thousand, six hundred seventy-two".