28120445 has 8 divisors (see below), whose sum is σ = 34172160. Its totient is φ = 22211280.

The previous prime is 28120423. The next prime is 28120447. The reversal of 28120445 is 54402182.

It is a happy number.

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

It is not a de Polignac number, because 28120445 - 2⁶ = 28120381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28120447) 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, 35201 + ... + 35990.

It is an arithmetic number, because the mean of its divisors is an integer number (4271520).

Almost surely, 2^28120445 is an apocalyptic number.

It is an amenable number.

28120445 is a deficient number, since it is larger than the sum of its proper divisors (6051715).

28120445 is an equidigital number, since it uses as much as digits as its factorization.

28120445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71275.

The product of its (nonzero) digits is 2560, while the sum is 26.

The square root of 28120445 is about 5302.8713919913. The cubic root of 28120445 is about 304.0936814522.

The spelling of 28120445 in words is "twenty-eight million, one hundred twenty thousand, four hundred forty-five".