28204431393 has 32 divisors (see below), whose sum is σ = 38355812352. Its totient is φ = 18432460800.

The previous prime is 28204431391. The next prime is 28204431397. The reversal of 28204431393 is 39313440282.

It is not a de Polignac number, because 28204431393 - 2¹ = 28204431391 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28204431391) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25946496 + ... + 25947582.

It is an arithmetic number, because the mean of its divisors is an integer number (1198619136).

Almost surely, 2^28204431393 is an apocalyptic number.

It is an amenable number.

28204431393 is a deficient number, since it is larger than the sum of its proper divisors (10151380959).

28204431393 is a wasteful number, since it uses less digits than its factorization.

28204431393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1965.

The product of its (nonzero) digits is 124416, while the sum is 39.

The spelling of 28204431393 in words is "twenty-eight billion, two hundred four million, four hundred thirty-one thousand, three hundred ninety-three".