6721680 has 80 divisors (see below), whose sum is σ = 23819904. Its totient is φ = 1536000.

The previous prime is 6721669. The next prime is 6721691. The reversal of 6721680 is 861276.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (6721669) and next prime (6721691).

It is a tau number, because it is divible by the number of its divisors (80).

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

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 321 + ... + 3680.

Almost surely, 2^6721680 is an apocalyptic number.

6721680 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 6721680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11909952).

6721680 is an abundant number, since it is smaller than the sum of its proper divisors (17098224).

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

6721680 is a wasteful number, since it uses less digits than its factorization.

6721680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4024 (or 4018 counting only the distinct ones).

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

The square root of 6721680 is about 2592.6202961483. The cubic root of 6721680 is about 188.7234835490.

The spelling of 6721680 in words is "six million, seven hundred twenty-one thousand, six hundred eighty".