6643902 has 8 divisors (see below), whose sum is σ = 13287816. Its totient is φ = 2214632.

The previous prime is 6643891. The next prime is 6643907. The reversal of 6643902 is 2093466.

It is a sphenic number, since it is the product of 3 distinct primes.

6643902 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 6643902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6643907) 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, 553653 + ... + 553664.

It is an arithmetic number, because the mean of its divisors is an integer number (1660977).

Almost surely, 2^6643902 is an apocalyptic number.

6643902 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

6643902 is a wasteful number, since it uses less digits than its factorization.

6643902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1107322.

The product of its (nonzero) digits is 7776, while the sum is 30.

The square root of 6643902 is about 2577.5767689828. The cubic root of 6643902 is about 187.9927377608.

The spelling of 6643902 in words is "six million, six hundred forty-three thousand, nine hundred two".