6721240 has 32 divisors (see below), whose sum is σ = 15266880. Its totient is φ = 2662912.

The previous prime is 6721237. The next prime is 6721259. The reversal of 6721240 is 421276.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3777 + ... + 5263.

It is an arithmetic number, because the mean of its divisors is an integer number (477090).

Almost surely, 2^6721240 is an apocalyptic number.

It is an amenable number.

6721240 is an abundant number, since it is smaller than the sum of its proper divisors (8545640).

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

6721240 is a wasteful number, since it uses less digits than its factorization.

6721240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1611 (or 1607 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 6721240 is about 2592.5354385235. The cubic root of 6721240 is about 188.7193655237.

The spelling of 6721240 in words is "six million, seven hundred twenty-one thousand, two hundred forty".