28373390389 has 4 divisors (see below), whose sum is σ = 28378331500. Its totient is φ = 28368449280.

The previous prime is 28373390333. The next prime is 28373390399. The reversal of 28373390389 is 98309337382.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98309337382 = 2 ⋅49154668691.

It can be written as a sum of positive squares in 2 ways, for example, as 5615254225 + 22758136164 = 74935^2 + 150858^2 .

It is a cyclic number.

It is not a de Polignac number, because 28373390389 - 2⁷ = 28373390261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28373390399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2461932 + ... + 2473429.

It is an arithmetic number, because the mean of its divisors is an integer number (7094582875).

Almost surely, 2^28373390389 is an apocalyptic number.

It is an amenable number.

28373390389 is a deficient number, since it is larger than the sum of its proper divisors (4941111).

28373390389 is an equidigital number, since it uses as much as digits as its factorization.

28373390389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4941110.

The product of its (nonzero) digits is 5878656, while the sum is 55.

The spelling of 28373390389 in words is "twenty-eight billion, three hundred seventy-three million, three hundred ninety thousand, three hundred eighty-nine".