28724003 has 16 divisors (see below), whose sum is σ = 36578304. Its totient is φ = 21903360.

The previous prime is 28723993. The next prime is 28724009. The reversal of 28724003 is 30042782.

It is a cyclic number.

It is not a de Polignac number, because 28724003 - 2¹⁴ = 28707619 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28724009) 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 15 ways as a sum of consecutive naturals, for example, 350 + ... + 7587.

It is an arithmetic number, because the mean of its divisors is an integer number (2286144).

Almost surely, 2^28724003 is an apocalyptic number.

28724003 is a deficient number, since it is larger than the sum of its proper divisors (7854301).

28724003 is a wasteful number, since it uses less digits than its factorization.

28724003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8002.

The product of its (nonzero) digits is 2688, while the sum is 26.

The square root of 28724003 is about 5359.4778663597. The cubic root of 28724003 is about 306.2539187059.

Adding to 28724003 its reverse (30042782), we get a palindrome (58766785).

The spelling of 28724003 in words is "twenty-eight million, seven hundred twenty-four thousand, three".