6463881 has 10 divisors (see below), whose sum is σ = 9656042. Its totient is φ = 4309200.

The previous prime is 6463879. The next prime is 6463883. The reversal of 6463881 is 1883646.

It is a happy number.

6463881 is a `hidden beast` number, since 646 + 3 + 8 + 8 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (6463879) and next prime (6463883).

It can be written as a sum of positive squares in only one way, i.e., 4665600 + 1798281 = 2160^2 + 1341^2 .

It is not a de Polignac number, because 6463881 - 2¹ = 6463879 is a prime.

It is a super-2 number, since 2×6463881² = 83563515164322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6463883) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 39820 + ... + 39981.

Almost surely, 2^6463881 is an apocalyptic number.

It is an amenable number.

6463881 is a deficient number, since it is larger than the sum of its proper divisors (3192161).

6463881 is an equidigital number, since it uses as much as digits as its factorization.

6463881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79813 (or 79804 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 6463881 is about 2542.4163703060. The cubic root of 6463881 is about 186.2792371861.

The spelling of 6463881 in words is "six million, four hundred sixty-three thousand, eight hundred eighty-one".