636774742 has 4 divisors (see below), whose sum is σ = 955162116. Its totient is φ = 318387370.

The previous prime is 636774739. The next prime is 636774793. The reversal of 636774742 is 247477636.

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

It is a junction number, because it is equal to n+sod(n) for n = 636774692 and 636774701.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159193684 + ... + 159193687.

It is an arithmetic number, because the mean of its divisors is an integer number (238790529).

Almost surely, 2^636774742 is an apocalyptic number.

636774742 is a deficient number, since it is larger than the sum of its proper divisors (318387374).

636774742 is a wasteful number, since it uses less digits than its factorization.

636774742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318387373.

The product of its digits is 1185408, while the sum is 46.

The square root of 636774742 is about 25234.3960102080. The cubic root of 636774742 is about 860.3238108185.

The spelling of 636774742 in words is "six hundred thirty-six million, seven hundred seventy-four thousand, seven hundred forty-two".