6881605 has 4 divisors (see below), whose sum is σ = 8257932. Its totient is φ = 5505280.

The previous prime is 6881603. The next prime is 6881639. The reversal of 6881605 is 5061886.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 736164 + 6145441 = 858^2 + 2479^2 .

It is not a de Polignac number, because 6881605 - 2¹ = 6881603 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 (6881603) 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, 688156 + ... + 688165.

It is an arithmetic number, because the mean of its divisors is an integer number (2064483).

Almost surely, 2^6881605 is an apocalyptic number.

It is an amenable number.

6881605 is a deficient number, since it is larger than the sum of its proper divisors (1376327).

6881605 is a wasteful number, since it uses less digits than its factorization.

6881605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1376326.

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 6881605 is about 2623.2813421362. The cubic root of 6881605 is about 190.2084968836.

The spelling of 6881605 in words is "six million, eight hundred eighty-one thousand, six hundred five".