6722781 has 16 divisors (see below), whose sum is σ = 9709056. Its totient is φ = 4113216.

The previous prime is 6722767. The next prime is 6722791. The reversal of 6722781 is 1872276.

It is not a de Polignac number, because 6722781 - 2⁶ = 6722717 is a prime.

It is a super-2 number, since 2×6722781² = 90391568747922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6722741) 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, 8311 + ... + 9083.

It is an arithmetic number, because the mean of its divisors is an integer number (606816).

Almost surely, 2^6722781 is an apocalyptic number.

It is an amenable number.

6722781 is a deficient number, since it is larger than the sum of its proper divisors (2986275).

6722781 is a wasteful number, since it uses less digits than its factorization.

6722781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1012.

The product of its digits is 9408, while the sum is 33.

The square root of 6722781 is about 2592.8326208994. The cubic root of 6722781 is about 188.7337871840.

It can be divided in two parts, 6722 and 781, that added together give a triangular number (7503 = T₁₂₂).

The spelling of 6722781 in words is "six million, seven hundred twenty-two thousand, seven hundred eighty-one".