636609947 has 8 divisors (see below), whose sum is σ = 646604112. Its totient is φ = 626630400.

The previous prime is 636609929. The next prime is 636609949. The reversal of 636609947 is 749906636.

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

It is a cyclic number.

It is not a de Polignac number, because 636609947 - 2⁸ = 636609691 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 636609895 and 636609904.

It is not an unprimeable number, because it can be changed into a prime (636609949) 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, 112547 + ... + 118067.

It is an arithmetic number, because the mean of its divisors is an integer number (80825514).

Almost surely, 2^636609947 is an apocalyptic number.

636609947 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

636609947 is a deficient number, since it is larger than the sum of its proper divisors (9994165).

636609947 is a wasteful number, since it uses less digits than its factorization.

636609947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7309.

The product of its (nonzero) digits is 1469664, while the sum is 50.

The square root of 636609947 is about 25231.1305137126. The cubic root of 636609947 is about 860.2495881852.

The spelling of 636609947 in words is "six hundred thirty-six million, six hundred nine thousand, nine hundred forty-seven".