6640902 has 12 divisors (see below), whose sum is σ = 14388660. Its totient is φ = 2213628.

The previous prime is 6640901. The next prime is 6640903. The reversal of 6640902 is 2090466.

It is an interprime number because it is at equal distance from previous prime (6640901) and next prime (6640903).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6640901) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 184452 + ... + 184487.

It is an arithmetic number, because the mean of its divisors is an integer number (1199055).

Almost surely, 2^6640902 is an apocalyptic number.

6640902 is an abundant number, since it is smaller than the sum of its proper divisors (7747758).

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

6640902 is a wasteful number, since it uses less digits than its factorization.

6640902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 368947 (or 368944 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 6640902 is about 2576.9947613451. The cubic root of 6640902 is about 187.9644379695.

Adding to 6640902 its sum of digits (27), we get a square (6640929 = 2577²).

The spelling of 6640902 in words is "six million, six hundred forty thousand, nine hundred two".