28400236193 has 18 divisors (see below), whose sum is σ = 34986354786. Its totient is φ = 22907191104.

The previous prime is 28400236169. The next prime is 28400236229. The reversal of 28400236193 is 39163200482.

It can be written as a sum of positive squares in only one way, i.e., 26729634064 + 1670602129 = 163492^2 + 40873^2 .

It is not a de Polignac number, because 28400236193 - 2⁶ = 28400236129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28400236103) 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 17 ways as a sum of consecutive naturals, for example, 4860968 + ... + 4866806.

It is an arithmetic number, because the mean of its divisors is an integer number (1943686377).

Almost surely, 2^28400236193 is an apocalyptic number.

It is an amenable number.

28400236193 is a deficient number, since it is larger than the sum of its proper divisors (6586118593).

28400236193 is an frugal number, since it uses more digits than its factorization.

28400236193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11709 (or 5863 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 38.

The spelling of 28400236193 in words is "twenty-eight billion, four hundred million, two hundred thirty-six thousand, one hundred ninety-three".