28024945 has 8 divisors (see below), whose sum is σ = 36216936. Its totient is φ = 20695296.

The previous prime is 28024939. The next prime is 28024967. The reversal of 28024945 is 54942082.

It can be written as a sum of positive squares in 4 ways, for example, as 3254416 + 24770529 = 1804^2 + 4977^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 28024945 - 2³ = 28024937 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28024945.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 215512 + ... + 215641.

It is an arithmetic number, because the mean of its divisors is an integer number (4527117).

Almost surely, 2^28024945 is an apocalyptic number.

It is an amenable number.

28024945 is a deficient number, since it is larger than the sum of its proper divisors (8191991).

28024945 is a wasteful number, since it uses less digits than its factorization.

28024945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431171.

The product of its (nonzero) digits is 23040, while the sum is 34.

The square root of 28024945 is about 5293.8591783311. The cubic root of 28024945 is about 303.7490462693.

The spelling of 28024945 in words is "twenty-eight million, twenty-four thousand, nine hundred forty-five".