28101839 has 4 divisors (see below), whose sum is σ = 28417680. Its totient is φ = 27786000.

The previous prime is 28101823. The next prime is 28101889. The reversal of 28101839 is 93810182.

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

It is a cyclic number.

It is not a de Polignac number, because 28101839 - 2⁴ = 28101823 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28101809) 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, 157787 + ... + 157964.

It is an arithmetic number, because the mean of its divisors is an integer number (7104420).

Almost surely, 2^28101839 is an apocalyptic number.

28101839 is a deficient number, since it is larger than the sum of its proper divisors (315841).

28101839 is an equidigital number, since it uses as much as digits as its factorization.

28101839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315840.

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 28101839 is about 5301.1167691346. The cubic root of 28101839 is about 304.0265984056.

The spelling of 28101839 in words is "twenty-eight million, one hundred one thousand, eight hundred thirty-nine".