6722640 has 60 divisors (see below), whose sum is σ = 22579284. Its totient is φ = 1792512.

The previous prime is 6722623. The next prime is 6722657. The reversal of 6722640 is 462276.

It is an interprime number because it is at equal distance from previous prime (6722623) and next prime (6722657).

It can be written as a sum of positive squares in 2 ways, for example, as 4717584 + 2005056 = 2172^2 + 1416^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3949 + ... + 5388.

Almost surely, 2^6722640 is an apocalyptic number.

6722640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6722640 is an abundant number, since it is smaller than the sum of its proper divisors (15856644).

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

6722640 is a wasteful number, since it uses less digits than its factorization.

6722640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9356 (or 9347 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 6722640 is about 2592.8054304170. The cubic root of 6722640 is about 188.7324677077.

The spelling of 6722640 in words is "six million, seven hundred twenty-two thousand, six hundred forty".