28290338749 has 4 divisors (see below), whose sum is σ = 28565002336. Its totient is φ = 28015675164.

The previous prime is 28290338737. The next prime is 28290338759. The reversal of 28290338749 is 94783309282.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28290338749 - 2⁵ = 28290338717 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28290338749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28290338759) 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, 137331639 + ... + 137331844.

It is an arithmetic number, because the mean of its divisors is an integer number (7141250584).

Almost surely, 2^28290338749 is an apocalyptic number.

It is an amenable number.

28290338749 is a deficient number, since it is larger than the sum of its proper divisors (274663587).

28290338749 is a wasteful number, since it uses less digits than its factorization.

28290338749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274663586.

The product of its (nonzero) digits is 5225472, while the sum is 55.

The spelling of 28290338749 in words is "twenty-eight billion, two hundred ninety million, three hundred thirty-eight thousand, seven hundred forty-nine".