6639057 has 32 divisors (see below), whose sum is σ = 10416000. Its totient is φ = 4173120.

The previous prime is 6639049. The next prime is 6639067. The reversal of 6639057 is 7509366.

It is a happy number.

It is not a de Polignac number, because 6639057 - 2³ = 6639049 is a prime.

6639057 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6639047) 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, 47694 + ... + 47832.

It is an arithmetic number, because the mean of its divisors is an integer number (325500).

Almost surely, 2^6639057 is an apocalyptic number.

It is an amenable number.

6639057 is a deficient number, since it is larger than the sum of its proper divisors (3776943).

6639057 is a wasteful number, since it uses less digits than its factorization.

6639057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238 (or 232 counting only the distinct ones).

The product of its (nonzero) digits is 34020, while the sum is 36.

The square root of 6639057 is about 2576.6367613616. The cubic root of 6639057 is about 187.9470293650.

The spelling of 6639057 in words is "six million, six hundred thirty-nine thousand, fifty-seven".