6444263 has 4 divisors (see below), whose sum is σ = 7364880. Its totient is φ = 5523648.

The previous prime is 6444259. The next prime is 6444271. The reversal of 6444263 is 3624446.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 6444263 - 2² = 6444259 is a prime.

It is a super-2 number, since 2×6444263² = 83057051226338, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6444233) 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, 460298 + ... + 460311.

It is an arithmetic number, because the mean of its divisors is an integer number (1841220).

Almost surely, 2^6444263 is an apocalyptic number.

6444263 is a deficient number, since it is larger than the sum of its proper divisors (920617).

6444263 is an equidigital number, since it uses as much as digits as its factorization.

6444263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 920616.

The product of its digits is 13824, while the sum is 29.

The square root of 6444263 is about 2538.5552978023. Note that the first 3 decimals coincide. The cubic root of 6444263 is about 186.0905925516.

The spelling of 6444263 in words is "six million, four hundred forty-four thousand, two hundred sixty-three".