6645672 has 64 divisors (see below), whose sum is σ = 20145600. Its totient is φ = 2013120.

The previous prime is 6645641. The next prime is 6645677. The reversal of 6645672 is 2765466.

6645672 is a `hidden beast` number, since 6 + 645 + 6 + 7 + 2 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (6645677) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 978 + ... + 3774.

It is an arithmetic number, because the mean of its divisors is an integer number (314775).

Almost surely, 2^6645672 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 6645672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10072800).

6645672 is an abundant number, since it is smaller than the sum of its proper divisors (13499928).

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

6645672 is a wasteful number, since it uses less digits than its factorization.

6645672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2823 (or 2813 counting only the distinct ones).

The product of its digits is 60480, while the sum is 36.

The square root of 6645672 is about 2577.9200918570. The cubic root of 6645672 is about 188.0094306421.

It can be divided in two parts, 664 and 5672, that added together give a palindrome (6336).

The spelling of 6645672 in words is "six million, six hundred forty-five thousand, six hundred seventy-two".