28320636394 has 8 divisors (see below), whose sum is σ = 42499455588. Its totient is φ = 14154151200.

The previous prime is 28320636367. The next prime is 28320636397. The reversal of 28320636394 is 49363602382.

It can be written as a sum of positive squares in 2 ways, for example, as 27154755369 + 1165881025 = 164787^2 + 34145^2 .

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

It is a super-2 number, since 2×28320636394² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28320636397) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 3077757 + ... + 3086944.

Almost surely, 2^28320636394 is an apocalyptic number.

28320636394 is a deficient number, since it is larger than the sum of its proper divisors (14178819194).

28320636394 is a wasteful number, since it uses less digits than its factorization.

28320636394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6167000.

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

It can be divided in two parts, 283206 and 36394, that added together give a triangular number (319600 = T₇₉₉).

The spelling of 28320636394 in words is "twenty-eight billion, three hundred twenty million, six hundred thirty-six thousand, three hundred ninety-four".