6720440 has 32 divisors (see below), whose sum is σ = 16012080. Its totient is φ = 2529792.

The previous prime is 6720437. The next prime is 6720443. The reversal of 6720440 is 440276.

It is an interprime number because it is at equal distance from previous prime (6720437) and next prime (6720443).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6720443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4262 + ... + 5621.

Almost surely, 2^6720440 is an apocalyptic number.

It is an amenable number.

6720440 is an abundant number, since it is smaller than the sum of its proper divisors (9291640).

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

6720440 is a wasteful number, since it uses less digits than its factorization.

6720440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9911 (or 9907 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 23.

The square root of 6720440 is about 2592.3811448165. The cubic root of 6720440 is about 188.7118777445.

The spelling of 6720440 in words is "six million, seven hundred twenty thousand, four hundred forty".