6720906 has 16 divisors (see below), whose sum is σ = 13728384. Its totient is φ = 2192544.

The previous prime is 6720887. The next prime is 6720911. The reversal of 6720906 is 6090276.

It is an Ulam 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 7 ways as a sum of consecutive naturals, for example, 11635 + ... + 12198.

It is an arithmetic number, because the mean of its divisors is an integer number (858024).

Almost surely, 2^6720906 is an apocalyptic number.

6720906 is an abundant number, since it is smaller than the sum of its proper divisors (7007478).

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

6720906 is a wasteful number, since it uses less digits than its factorization.

6720906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23885.

The product of its (nonzero) digits is 4536, while the sum is 30.

The square root of 6720906 is about 2592.4710220174. The cubic root of 6720906 is about 188.7162394481.

It can be divided in two parts, 6720 and 906, that added together give a triangular number (7626 = T₁₂₃).

The spelling of 6720906 in words is "six million, seven hundred twenty thousand, nine hundred six".