672640 has 32 divisors (see below), whose sum is σ = 1609560. Its totient is φ = 268800.

The previous prime is 672629. The next prime is 672641. The reversal of 672640 is 46276.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (672641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115 + ... + 1165.

2⁶⁷²⁶⁴⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 672640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (804780).

672640 is an abundant number, since it is smaller than the sum of its proper divisors (936920).

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

672640 is a wasteful number, since it uses less digits than its factorization.

672640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1070 (or 1058 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 672640 is about 820.1463284073. The cubic root of 672640 is about 87.6181804457.

The spelling of 672640 in words is "six hundred seventy-two thousand, six hundred forty".