6493631778 has 24 divisors (see below), whose sum is σ = 14120338908. Its totient is φ = 2156728032.

The previous prime is 6493631743. The next prime is 6493631779. The reversal of 6493631778 is 8771363946.

6493631778 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 6387685929 + 105945849 = 79923^2 + 10293^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6493631779) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 646201 + ... + 656172.

Almost surely, 2^6493631778 is an apocalyptic number.

6493631778 is an abundant number, since it is smaller than the sum of its proper divisors (7626707130).

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

6493631778 is a wasteful number, since it uses less digits than its factorization.

6493631778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1302658 (or 1302655 counting only the distinct ones).

The product of its digits is 4572288, while the sum is 54.

The square root of 6493631778 is about 80583.0737686271. The cubic root of 6493631778 is about 1865.6459059364.

The spelling of 6493631778 in words is "six billion, four hundred ninety-three million, six hundred thirty-one thousand, seven hundred seventy-eight".