642672 has 30 divisors (see below), whose sum is σ = 1798992. Its totient is φ = 214176.

The previous prime is 642623. The next prime is 642673. The reversal of 642672 is 276246.

642672 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642673) by changing a digit.

642672 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, 2088 + ... + 2375.

2⁶⁴²⁶⁷² is an apocalyptic number.

It is an amenable number.

642672 is an abundant number, since it is smaller than the sum of its proper divisors (1156320).

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

642672 is a wasteful number, since it uses less digits than its factorization.

642672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4477 (or 4468 counting only the distinct ones).

The product of its digits is 4032, while the sum is 27.

The square root of 642672 is about 801.6682605667. The cubic root of 642672 is about 86.2971512822.

The spelling of 642672 in words is "six hundred forty-two thousand, six hundred seventy-two".