672161256 has 48 divisors (see below), whose sum is σ = 1960473060. Its totient is φ = 206818560.

The previous prime is 672161227. The next prime is 672161299. The reversal of 672161256 is 652161276.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 662238756 + 9922500 = 25734^2 + 3150^2 .

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

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

It is a self number, because there is not a number n which added to its sum of digits gives 672161256.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 358125 + ... + 359996.

Almost surely, 2^672161256 is an apocalyptic number.

It is an amenable number.

672161256 is an abundant number, since it is smaller than the sum of its proper divisors (1288311804).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

672161256 is a wasteful number, since it uses less digits than its factorization.

672161256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 718146 (or 718139 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 672161256 is about 25926.0728996892. The cubic root of 672161256 is about 875.9738842530.

The spelling of 672161256 in words is "six hundred seventy-two million, one hundred sixty-one thousand, two hundred fifty-six".