6642906 has 32 divisors (see below), whose sum is σ = 14249088. Its totient is φ = 2059200.

The previous prime is 6642893. The next prime is 6642907. The reversal of 6642906 is 6092466.

It is not an unprimeable number, because it can be changed into a prime (6642907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4456 + ... + 5756.

It is an arithmetic number, because the mean of its divisors is an integer number (445284).

Almost surely, 2^6642906 is an apocalyptic number.

6642906 is an abundant number, since it is smaller than the sum of its proper divisors (7606182).

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

6642906 is a wasteful number, since it uses less digits than its factorization.

6642906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1366.

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 6642906 is about 2577.3835570206. The cubic root of 6642906 is about 187.9833431749.

It can be divided in two parts, 664 and 2906, that added together give a triangular number (3570 = T₈₄).

The spelling of 6642906 in words is "six million, six hundred forty-two thousand, nine hundred six".