28828749 has 4 divisors (see below), whose sum is σ = 38438336. Its totient is φ = 19219164.

The previous prime is 28828741. The next prime is 28828799. The reversal of 28828749 is 94782882.

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 not a de Polignac number, because 28828749 - 2³ = 28828741 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 28828698 and 28828707.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28828741) 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, 4804789 + ... + 4804794.

It is an arithmetic number, because the mean of its divisors is an integer number (9609584).

Almost surely, 2^28828749 is an apocalyptic number.

It is an amenable number.

28828749 is a deficient number, since it is larger than the sum of its proper divisors (9609587).

28828749 is an equidigital number, since it uses as much as digits as its factorization.

28828749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9609586.

The product of its digits is 516096, while the sum is 48.

The square root of 28828749 is about 5369.2410078148. The cubic root of 28828749 is about 306.6257326954.

The spelling of 28828749 in words is "twenty-eight million, eight hundred twenty-eight thousand, seven hundred forty-nine".