28304045 has 16 divisors (see below), whose sum is σ = 42346368. Its totient is φ = 17643840.

The previous prime is 28304039. The next prime is 28304057. The reversal of 28304045 is 54040382.

It is not a de Polignac number, because 28304045 - 2¹⁰ = 28303021 is a prime.

It is a super-2 number, since 2×28304045² = 1602237926724050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36374 + ... + 37143.

It is an arithmetic number, because the mean of its divisors is an integer number (2646648).

Almost surely, 2^28304045 is an apocalyptic number.

It is an amenable number.

28304045 is a deficient number, since it is larger than the sum of its proper divisors (14042323).

28304045 is a wasteful number, since it uses less digits than its factorization.

28304045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73540.

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 28304045 is about 5320.1546030167. The cubic root of 28304045 is about 304.7540613468.

The spelling of 28304045 in words is "twenty-eight million, three hundred four thousand, forty-five".