6640893 has 32 divisors (see below), whose sum is σ = 11531520. Its totient is φ = 3697920.

The previous prime is 6640891. The next prime is 6640901. The reversal of 6640893 is 3980466.

6640893 is a `hidden beast` number, since 6 + 640 + 8 + 9 + 3 = 666.

It is not a de Polignac number, because 6640893 - 2¹ = 6640891 is a prime.

It is an Ulam number.

6640893 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6640891) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7321 + ... + 8177.

It is an arithmetic number, because the mean of its divisors is an integer number (360360).

Almost surely, 2^6640893 is an apocalyptic number.

6640893 is a gapful number since it is divisible by the number (63) formed by its first and last digit.

It is an amenable number.

6640893 is a deficient number, since it is larger than the sum of its proper divisors (4890627).

6640893 is a wasteful number, since it uses less digits than its factorization.

6640893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 914 (or 908 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 6640893 is about 2576.9930151244. The cubic root of 6640893 is about 187.9643530573.

Adding to 6640893 its sum of digits (36), we get a square (6640929 = 2577²).

The spelling of 6640893 in words is "six million, six hundred forty thousand, eight hundred ninety-three".