6722520 has 128 divisors (see below), whose sum is σ = 23639040. Its totient is φ = 1497600.

The previous prime is 6722479. The next prime is 6722537. The reversal of 6722520 is 252276.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 44445 + ... + 44595.

It is an arithmetic number, because the mean of its divisors is an integer number (184680).

Almost surely, 2^6722520 is an apocalyptic number.

6722520 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6722520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11819520).

6722520 is an abundant number, since it is smaller than the sum of its proper divisors (16916520).

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

6722520 is a wasteful number, since it uses less digits than its factorization.

6722520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225 (or 221 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 6722520 is about 2592.7822893564. The cubic root of 6722520 is about 188.7313447346.

Adding to 6722520 its reverse (252276), we get a palindrome (6974796).

The spelling of 6722520 in words is "six million, seven hundred twenty-two thousand, five hundred twenty".