6643692 has 72 divisors (see below), whose sum is σ = 19306560. Its totient is φ = 1905120.

The previous prime is 6643691. The next prime is 6643699. The reversal of 6643692 is 2963466.

6643692 is a `hidden beast` number, since 6 + 643 + 6 + 9 + 2 = 666.

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

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

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (6643691) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7083 + ... + 7965.

Almost surely, 2^6643692 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 6643692, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9653280).

6643692 is an abundant number, since it is smaller than the sum of its proper divisors (12662868).

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

6643692 is a wasteful number, since it uses less digits than its factorization.

6643692 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 923 (or 918 counting only the distinct ones).

The product of its digits is 46656, while the sum is 36.

The square root of 6643692 is about 2577.5360327258. The cubic root of 6643692 is about 187.9907570527.

It can be divided in two parts, 664 and 3692, that added together give a square (4356 = 66²).

The spelling of 6643692 in words is "six million, six hundred forty-three thousand, six hundred ninety-two".