672156 has 18 divisors (see below), whose sum is σ = 1699152. Its totient is φ = 224040.

The previous prime is 672151. The next prime is 672167. The reversal of 672156 is 651276.

It is a tau number, because it is divible by the number of its divisors (18).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (672151) by changing a digit.

672156 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9300 + ... + 9371.

2⁶⁷²¹⁵⁶ is an apocalyptic number.

It is an amenable number.

672156 is an abundant number, since it is smaller than the sum of its proper divisors (1026996).

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

672156 is a wasteful number, since it uses less digits than its factorization.

672156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18681 (or 18676 counting only the distinct ones).

The product of its digits is 2520, while the sum is 27.

The square root of 672156 is about 819.8512060124. The cubic root of 672156 is about 87.5971601006.

It can be divided in two parts, 672 and 156, that added together give a palindrome (828).

The spelling of 672156 in words is "six hundred seventy-two thousand, one hundred fifty-six".