6638755 has 16 divisors (see below), whose sum is σ = 8545824. Its totient is φ = 4933120.

The previous prime is 6638741. The next prime is 6638773. The reversal of 6638755 is 5578366.

It is not a de Polignac number, because 6638755 - 2⁷ = 6638627 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6585 + ... + 7525.

It is an arithmetic number, because the mean of its divisors is an integer number (534114).

Almost surely, 2^6638755 is an apocalyptic number.

6638755 is a deficient number, since it is larger than the sum of its proper divisors (1907069).

6638755 is a wasteful number, since it uses less digits than its factorization.

6638755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1046.

The product of its digits is 151200, while the sum is 40.

The square root of 6638755 is about 2576.5781571689. The cubic root of 6638755 is about 187.9441795193.

The spelling of 6638755 in words is "six million, six hundred thirty-eight thousand, seven hundred fifty-five".