28401243 has 16 divisors (see below), whose sum is σ = 41475840. Its totient is φ = 17180064.

The previous prime is 28401229. The next prime is 28401259. The reversal of 28401243 is 34210482.

It is not a de Polignac number, because 28401243 - 2⁴ = 28401227 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28401223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3871 + ... + 8472.

It is an arithmetic number, because the mean of its divisors is an integer number (2592240).

Almost surely, 2^28401243 is an apocalyptic number.

28401243 is a deficient number, since it is larger than the sum of its proper divisors (13074597).

28401243 is a wasteful number, since it uses less digits than its factorization.

28401243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12418.

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 28401243 is about 5329.2816589105. The cubic root of 28401243 is about 305.1025114523.

The spelling of 28401243 in words is "twenty-eight million, four hundred one thousand, two hundred forty-three".