42731194778 has 16 divisors (see below), whose sum is σ = 66496934400. Its totient is φ = 20572477200.

The previous prime is 42731194777. The next prime is 42731194789. The reversal of 42731194778 is 87749113724.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (42731194777) 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, 1719353 + ... + 1744028.

It is an arithmetic number, because the mean of its divisors is an integer number (4156058400).

Almost surely, 2^42731194778 is an apocalyptic number.

42731194778 is a deficient number, since it is larger than the sum of its proper divisors (23765739622).

42731194778 is a wasteful number, since it uses less digits than its factorization.

42731194778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3463613.

The product of its digits is 2370816, while the sum is 53.

The spelling of 42731194778 in words is "forty-two billion, seven hundred thirty-one million, one hundred ninety-four thousand, seven hundred seventy-eight".