28020445 has 8 divisors (see below), whose sum is σ = 33685344. Its totient is φ = 22375824.

The previous prime is 28020407. The next prime is 28020449. The reversal of 28020445 is 54402082.

It is a happy number.

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 28020445 - 2¹⁵ = 27987677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28020449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1839 + ... + 7708.

It is an arithmetic number, because the mean of its divisors is an integer number (4210668).

Almost surely, 2^28020445 is an apocalyptic number.

It is an amenable number.

28020445 is a deficient number, since it is larger than the sum of its proper divisors (5664899).

28020445 is an equidigital number, since it uses as much as digits as its factorization.

28020445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10139.

The product of its (nonzero) digits is 2560, while the sum is 25.

The square root of 28020445 is about 5293.4341405179. The cubic root of 28020445 is about 303.7327876127.

The spelling of 28020445 in words is "twenty-eight million, twenty thousand, four hundred forty-five".