6881690 has 32 divisors (see below), whose sum is σ = 12994560. Its totient is φ = 2620800.

The previous prime is 6881683. The next prime is 6881713. The reversal of 6881690 is 961886.

It is a super-2 number, since 2×6881690² = 94715314512200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

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, 24350 + ... + 24630.

It is an arithmetic number, because the mean of its divisors is an integer number (406080).

Almost surely, 2^6881690 is an apocalyptic number.

6881690 is a deficient number, since it is larger than the sum of its proper divisors (6112870).

6881690 is a wasteful number, since it uses less digits than its factorization.

6881690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398.

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 6881690 is about 2623.2975431697. The cubic root of 6881690 is about 190.2092800176.

It can be divided in two parts, 68816 and 90, that multiplied together give a triangular number (6193440 = T₃₅₁₉).

The spelling of 6881690 in words is "six million, eight hundred eighty-one thousand, six hundred ninety".