6431782578 has 32 divisors (see below), whose sum is σ = 13889304576. Its totient is φ = 1973833728.

The previous prime is 6431782571. The next prime is 6431782579. The reversal of 6431782578 is 8752871346.

It is a self number, because there is not a number n which added to its sum of digits gives 6431782578.

It is not an unprimeable number, because it can be changed into a prime (6431782571) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77775 + ... + 137522.

It is an arithmetic number, because the mean of its divisors is an integer number (434040768).

Almost surely, 2^6431782578 is an apocalyptic number.

6431782578 is an abundant number, since it is smaller than the sum of its proper divisors (7457521998).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6431782578 is a wasteful number, since it uses less digits than its factorization.

6431782578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215698.

The product of its digits is 2257920, while the sum is 51.

The square root of 6431782578 is about 80198.3951086304. The cubic root of 6431782578 is about 1859.7038278568.

The spelling of 6431782578 in words is "six billion, four hundred thirty-one million, seven hundred eighty-two thousand, five hundred seventy-eight".