28444929 has 4 divisors (see below), whose sum is σ = 37926576. Its totient is φ = 18963284.

The previous prime is 28444921. The next prime is 28444931. The reversal of 28444929 is 92944482.

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 28444929 - 2³ = 28444921 is a prime.

It is a super-2 number, since 2×28444929² = 1618227971630082, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28444921) 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, 4740819 + ... + 4740824.

It is an arithmetic number, because the mean of its divisors is an integer number (9481644).

Almost surely, 2^28444929 is an apocalyptic number.

It is an amenable number.

28444929 is a deficient number, since it is larger than the sum of its proper divisors (9481647).

28444929 is an equidigital number, since it uses as much as digits as its factorization.

28444929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9481646.

The product of its digits is 165888, while the sum is 42.

The square root of 28444929 is about 5333.3787602232. The cubic root of 28444929 is about 305.2588647054.

The spelling of 28444929 in words is "twenty-eight million, four hundred forty-four thousand, nine hundred twenty-nine".