28544330 has 8 divisors (see below), whose sum is σ = 51379812. Its totient is φ = 11417728.

The previous prime is 28544293. The next prime is 28544333. The reversal of 28544330 is 3344582.

It can be written as a sum of positive squares in 2 ways, for example, as 26553409 + 1990921 = 5153^2 + 1411^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 28544293 and 28544302.

It is not an unprimeable number, because it can be changed into a prime (28544333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1427207 + ... + 1427226.

Almost surely, 2^28544330 is an apocalyptic number.

28544330 is a deficient number, since it is larger than the sum of its proper divisors (22835482).

28544330 is a wasteful number, since it uses less digits than its factorization.

28544330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2854440.

The product of its (nonzero) digits is 11520, while the sum is 29.

The square root of 28544330 is about 5342.6893976723. The cubic root of 28544330 is about 305.6140277202.

The spelling of 28544330 in words is "twenty-eight million, five hundred forty-four thousand, three hundred thirty".