6640455 has 16 divisors (see below), whose sum is σ = 11250144. Its totient is φ = 3333120.

The previous prime is 6640453. The next prime is 6640463. The reversal of 6640455 is 5540466.

It is not a de Polignac number, because 6640455 - 2¹ = 6640453 is a prime.

6640455 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6640451) 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, 12766 + ... + 13275.

It is an arithmetic number, because the mean of its divisors is an integer number (703134).

Almost surely, 2^6640455 is an apocalyptic number.

6640455 is a deficient number, since it is larger than the sum of its proper divisors (4609689).

6640455 is a wasteful number, since it uses less digits than its factorization.

6640455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26066.

The product of its (nonzero) digits is 14400, while the sum is 30.

The square root of 6640455 is about 2576.9080309549. The cubic root of 6640455 is about 187.9602205710.

The spelling of 6640455 in words is "six million, six hundred forty thousand, four hundred fifty-five".