636842738 has 8 divisors (see below), whose sum is σ = 1091730432. Its totient is φ = 272932596.

The previous prime is 636842737. The next prime is 636842777. The reversal of 636842738 is 837248636.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 636842692 and 636842701.

It is not an unprimeable number, because it can be changed into a prime (636842737) 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, 22744370 + ... + 22744397.

It is an arithmetic number, because the mean of its divisors is an integer number (136466304).

Almost surely, 2^636842738 is an apocalyptic number.

636842738 is a deficient number, since it is larger than the sum of its proper divisors (454887694).

636842738 is a wasteful number, since it uses less digits than its factorization.

636842738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45488776.

The product of its digits is 1161216, while the sum is 47.

The square root of 636842738 is about 25235.7432622857. The cubic root of 636842738 is about 860.3544320581.

The spelling of 636842738 in words is "six hundred thirty-six million, eight hundred forty-two thousand, seven hundred thirty-eight".