28003638168530 has 8 divisors (see below), whose sum is σ = 50406548703372. Its totient is φ = 11201455267408.

The previous prime is 28003638168529. The next prime is 28003638168551. The reversal of 28003638168530 is 3586183630082.

It can be written as a sum of positive squares in 2 ways, for example, as 26267439281329 + 1736198887201 = 5125177^2 + 1317649^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1400181908417 + ... + 1400181908436.

Almost surely, 2^{28003638168530} is an apocalyptic number.

28003638168530 is a deficient number, since it is larger than the sum of its proper divisors (22402910534842).

28003638168530 is a wasteful number, since it uses less digits than its factorization.

28003638168530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2800363816860.

The product of its (nonzero) digits is 4976640, while the sum is 53.

The spelling of 28003638168530 in words is "twenty-eight trillion, three billion, six hundred thirty-eight million, one hundred sixty-eight thousand, five hundred thirty".