6440676431 has 4 divisors (see below), whose sum is σ = 7360773072. Its totient is φ = 5520579792.

The previous prime is 6440676427. The next prime is 6440676461. The reversal of 6440676431 is 1346760446.

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

It is not a de Polignac number, because 6440676431 - 2² = 6440676427 is a prime.

It is a super-2 number, since 2×6440676431² = 82964625777677795522, 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 (6440676401) 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, 460048310 + ... + 460048323.

It is an arithmetic number, because the mean of its divisors is an integer number (1840193268).

Almost surely, 2^6440676431 is an apocalyptic number.

6440676431 is a deficient number, since it is larger than the sum of its proper divisors (920096641).

6440676431 is an equidigital number, since it uses as much as digits as its factorization.

6440676431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 920096640.

The product of its (nonzero) digits is 290304, while the sum is 41.

The square root of 6440676431 is about 80253.8250241071. The cubic root of 6440676431 is about 1860.5606309968.

The spelling of 6440676431 in words is "six billion, four hundred forty million, six hundred seventy-six thousand, four hundred thirty-one".