28045433 has 4 divisors (see below), whose sum is σ = 30202788. Its totient is φ = 25888080.

The previous prime is 28045403. The next prime is 28045447. The reversal of 28045433 is 33454082.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 33454082 = 2 ⋅16727041.

It can be written as a sum of positive squares in 2 ways, for example, as 3523129 + 24522304 = 1877^2 + 4952^2 .

It is a cyclic number.

It is not a de Polignac number, because 28045433 - 2¹⁴ = 28029049 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28045396 and 28045405.

It is not an unprimeable number, because it can be changed into a prime (28045403) 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, 1078658 + ... + 1078683.

It is an arithmetic number, because the mean of its divisors is an integer number (7550697).

Almost surely, 2^28045433 is an apocalyptic number.

It is an amenable number.

28045433 is a deficient number, since it is larger than the sum of its proper divisors (2157355).

28045433 is a wasteful number, since it uses less digits than its factorization.

28045433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2157354.

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

The square root of 28045433 is about 5295.7938970470. The cubic root of 28045433 is about 303.8230481339.

The spelling of 28045433 in words is "twenty-eight million, forty-five thousand, four hundred thirty-three".