6440407331 has 8 divisors (see below), whose sum is σ = 6648055920. Its totient is φ = 6234526368.

The previous prime is 6440407301. The next prime is 6440407349. The reversal of 6440407331 is 1337040446.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6440407331 - 2²⁶ = 6373298467 is a prime.

It is a super-2 number, since 2×6440407331² = 82957693178397087122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6440407301) 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, 434501 + ... + 449078.

It is an arithmetic number, because the mean of its divisors is an integer number (831006990).

Almost surely, 2^6440407331 is an apocalyptic number.

6440407331 is a deficient number, since it is larger than the sum of its proper divisors (207648589).

6440407331 is a wasteful number, since it uses less digits than its factorization.

6440407331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 883813.

The product of its (nonzero) digits is 24192, while the sum is 32.

The square root of 6440407331 is about 80252.1484509916. The cubic root of 6440407331 is about 1860.5347184060.

Adding to 6440407331 its reverse (1337040446), we get a palindrome (7777447777).

The spelling of 6440407331 in words is "six billion, four hundred forty million, four hundred seven thousand, three hundred thirty-one".