636666328 has 8 divisors (see below), whose sum is σ = 1193749380. Its totient is φ = 318333160.

The previous prime is 636666323. The next prime is 636666341. The reversal of 636666328 is 823666636.

636666328 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (636666323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39791638 + ... + 39791653.

Almost surely, 2^636666328 is an apocalyptic number.

It is an amenable number.

636666328 is a deficient number, since it is larger than the sum of its proper divisors (557083052).

636666328 is a wasteful number, since it uses less digits than its factorization.

636666328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79583297 (or 79583293 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 46.

The square root of 636666328 is about 25232.2477793795. The cubic root of 636666328 is about 860.2749832749.

The spelling of 636666328 in words is "six hundred thirty-six million, six hundred sixty-six thousand, three hundred twenty-eight".