28253921799 has 4 divisors (see below), whose sum is σ = 37671895736. Its totient is φ = 18835947864.

The previous prime is 28253921789. The next prime is 28253921803. The reversal of 28253921799 is 99712935282.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 28253921799 - 2⁵ = 28253921767 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 (28253921779) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4708986964 + ... + 4708986969.

It is an arithmetic number, because the mean of its divisors is an integer number (9417973934).

Almost surely, 2^28253921799 is an apocalyptic number.

28253921799 is a deficient number, since it is larger than the sum of its proper divisors (9417973937).

28253921799 is an equidigital number, since it uses as much as digits as its factorization.

28253921799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9417973936.

The product of its digits is 4898880, while the sum is 57.

The spelling of 28253921799 in words is "twenty-eight billion, two hundred fifty-three million, nine hundred twenty-one thousand, seven hundred ninety-nine".