636828642 has 48 divisors (see below), whose sum is σ = 1447074720. Its totient is φ = 209876832.

The previous prime is 636828641. The next prime is 636828659. The reversal of 636828642 is 246828636.

636828642 is a `hidden beast` number, since 6 + 368 + 286 + 4 + 2 = 666.

It is not an unprimeable number, because it can be changed into a prime (636828641) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 35893 + ... + 50615.

It is an arithmetic number, because the mean of its divisors is an integer number (30147390).

Almost surely, 2^636828642 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 636828642, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (723537360).

636828642 is an abundant number, since it is smaller than the sum of its proper divisors (810246078).

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

636828642 is a wasteful number, since it uses less digits than its factorization.

636828642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14829 (or 14817 counting only the distinct ones).

The product of its digits is 663552, while the sum is 45.

The square root of 636828642 is about 25235.4639743358. The cubic root of 636828642 is about 860.3480842609.

The spelling of 636828642 in words is "six hundred thirty-six million, eight hundred twenty-eight thousand, six hundred forty-two".