6344778431 has 4 divisors (see below), whose sum is σ = 6348699000. Its totient is φ = 6340857864.

The previous prime is 6344778371. The next prime is 6344778443. The reversal of 6344778431 is 1348774436.

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 6344778431 - 2²² = 6340584127 is a prime.

It is a super-2 number, since 2×6344778431² = 80512426676965643522, 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 (6344778631) 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, 1957856 + ... + 1961093.

It is an arithmetic number, because the mean of its divisors is an integer number (1587174750).

Almost surely, 2^6344778431 is an apocalyptic number.

6344778431 is a deficient number, since it is larger than the sum of its proper divisors (3920569).

6344778431 is a wasteful number, since it uses less digits than its factorization.

6344778431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3920568.

The product of its digits is 1354752, while the sum is 47.

The square root of 6344778431 is about 79654.1174767507. The cubic root of 6344778431 is about 1851.2801882743.

The spelling of 6344778431 in words is "six billion, three hundred forty-four million, seven hundred seventy-eight thousand, four hundred thirty-one".