6681407 has 4 divisors (see below), whose sum is σ = 7033080. Its totient is φ = 6329736.

The previous prime is 6681403. The next prime is 6681419. The reversal of 6681407 is 7041866.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 6681407 - 2² = 6681403 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6681403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 175808 + ... + 175845.

It is an arithmetic number, because the mean of its divisors is an integer number (1758270).

Almost surely, 2^6681407 is an apocalyptic number.

6681407 is a deficient number, since it is larger than the sum of its proper divisors (351673).

6681407 is a wasteful number, since it uses less digits than its factorization.

6681407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351672.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 6681407 is about 2584.8417746547. The cubic root of 6681407 is about 188.3458155161.

The spelling of 6681407 in words is "six million, six hundred eighty-one thousand, four hundred seven".