6721860 has 24 divisors (see below), whose sum is σ = 18821376. Its totient is φ = 1792480.

The previous prime is 6721859. The next prime is 6721861. The reversal of 6721860 is 681276.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (6721859) and next prime (6721861).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (6721861) 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, 55956 + ... + 56075.

It is an arithmetic number, because the mean of its divisors is an integer number (784224).

Almost surely, 2^6721860 is an apocalyptic number.

6721860 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6721860 is an abundant number, since it is smaller than the sum of its proper divisors (12099516).

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

6721860 is a wasteful number, since it uses less digits than its factorization.

6721860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112043 (or 112041 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 6721860 is about 2592.6550098307. The cubic root of 6721860 is about 188.7251681439.

The spelling of 6721860 in words is "six million, seven hundred twenty-one thousand, eight hundred sixty".