636673928 has 36 divisors (see below), whose sum is σ = 1313773335. Its totient is φ = 289040400.

The previous prime is 636673909. The next prime is 636673931. The reversal of 636673928 is 829376636.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 318336964 + 318336964 = 17842^2 + 17842^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=17842.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 784643 + ... + 785453.

Almost surely, 2^636673928 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 636673928

636673928 is an abundant number, since it is smaller than the sum of its proper divisors (677099407).

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

636673928 is an equidigital number, since it uses as much as digits as its factorization.

636673928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1650 (or 824 counting only the distinct ones).

The product of its digits is 1959552, while the sum is 50.

The square root of 636673928 is about 25232.3983798608. The cubic root of 636673928 is about 860.2784063468.

Multiplying 636673928 by its sum of digits (50), we get a square (31833696400 = 178420²).

The spelling of 636673928 in words is "six hundred thirty-six million, six hundred seventy-three thousand, nine hundred twenty-eight".