6720381 has 8 divisors (see below), whose sum is σ = 9956160. Its totient is φ = 4480236.

The previous prime is 6720377. The next prime is 6720383. The reversal of 6720381 is 1830276.

6720381 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 6720381 - 2² = 6720377 is a prime.

It is a super-2 number, since 2×6720381² = 90327041570322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 248903 = 6720381 / (6 + 7 + 2 + 0 + 3 + 8 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6720383) 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, 124425 + ... + 124478.

It is an arithmetic number, because the mean of its divisors is an integer number (1244520).

Almost surely, 2^6720381 is an apocalyptic number.

It is an amenable number.

6720381 is a deficient number, since it is larger than the sum of its proper divisors (3235779).

6720381 is a wasteful number, since it uses less digits than its factorization.

6720381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248912 (or 248906 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 6720381 is about 2592.3697652920. The cubic root of 6720381 is about 188.7113254973.

The spelling of 6720381 in words is "six million, seven hundred twenty thousand, three hundred eighty-one".