6446881 has 12 divisors (see below), whose sum is σ = 7684740. Its totient is φ = 5389440.

The previous prime is 6446863. The next prime is 6446929. The reversal of 6446881 is 1886446.

It can be written as a sum of positive squares in 2 ways, for example, as 1677025 + 4769856 = 1295^2 + 2184^2 .

It is not a de Polignac number, because 6446881 - 2¹⁹ = 5922593 is a prime.

It is a super-2 number, since 2×6446881² = 83124549256322, which contains 22 as substring.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 6446881.

It is not an unprimeable number, because it can be changed into a prime (6446801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 405 + ... + 3613.

It is an arithmetic number, because the mean of its divisors is an integer number (640395).

Almost surely, 2^6446881 is an apocalyptic number.

It is an amenable number.

6446881 is a deficient number, since it is larger than the sum of its proper divisors (1237859).

6446881 is a wasteful number, since it uses less digits than its factorization.

6446881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3264 (or 3257 counting only the distinct ones).

The product of its digits is 36864, while the sum is 37.

The square root of 6446881 is about 2539.0708930631. The cubic root of 6446881 is about 186.1157890824.

The spelling of 6446881 in words is "six million, four hundred forty-six thousand, eight hundred eighty-one".