6781890 has 16 divisors (see below), whose sum is σ = 16276608. Its totient is φ = 1808496.

The previous prime is 6781867. The next prime is 6781891. The reversal of 6781890 is 981876.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (6781891) 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, 113002 + ... + 113061.

It is an arithmetic number, because the mean of its divisors is an integer number (1017288).

Almost surely, 2^6781890 is an apocalyptic number.

6781890 is an abundant number, since it is smaller than the sum of its proper divisors (9494718).

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

6781890 is a wasteful number, since it uses less digits than its factorization.

6781890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226073.

The product of its (nonzero) digits is 24192, while the sum is 39.

The square root of 6781890 is about 2604.2062130331. The cubic root of 6781890 is about 189.2853113623.

The spelling of 6781890 in words is "six million, seven hundred eighty-one thousand, eight hundred ninety".