28125445 has 8 divisors (see below), whose sum is σ = 33784344. Its totient is φ = 22477824.

The previous prime is 28125437. The next prime is 28125473. The reversal of 28125445 is 54452182.

It can be written as a sum of positive squares in 4 ways, for example, as 3265249 + 24860196 = 1807^2 + 4986^2 .

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 28125445 - 2³ = 28125437 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4317 + ... + 8653.

It is an arithmetic number, because the mean of its divisors is an integer number (4223043).

Almost surely, 2^28125445 is an apocalyptic number.

It is an amenable number.

28125445 is a deficient number, since it is larger than the sum of its proper divisors (5658899).

28125445 is a wasteful number, since it uses less digits than its factorization.

28125445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5639.

The product of its digits is 12800, while the sum is 31.

The square root of 28125445 is about 5303.3428137355. The cubic root of 28125445 is about 304.1117036694. Note that the first 3 decimals are identical.

The spelling of 28125445 in words is "twenty-eight million, one hundred twenty-five thousand, four hundred forty-five".