28044769 has 4 divisors (see below), whose sum is σ = 29011860. Its totient is φ = 27077680.

The previous prime is 28044767. The next prime is 28044823. The reversal of 28044769 is 96744082.

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

It can be written as a sum of positive squares in 2 ways, for example, as 15171025 + 12873744 = 3895^2 + 3588^2 .

It is a cyclic number.

It is not a de Polignac number, because 28044769 - 2¹ = 28044767 is a prime.

It is a super-2 number, since 2×28044769² = 1573018136526722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28044761) 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, 483502 + ... + 483559.

It is an arithmetic number, because the mean of its divisors is an integer number (7252965).

Almost surely, 2^28044769 is an apocalyptic number.

28044769 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

28044769 is a deficient number, since it is larger than the sum of its proper divisors (967091).

28044769 is an equidigital number, since it uses as much as digits as its factorization.

28044769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 967090.

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 28044769 is about 5295.7312054144. The cubic root of 28044769 is about 303.8206503568.

The spelling of 28044769 in words is "twenty-eight million, forty-four thousand, seven hundred sixty-nine".