28791445 has 8 divisors (see below), whose sum is σ = 34770744. Its totient is φ = 22885824.

The previous prime is 28791431. The next prime is 28791449. The reversal of 28791445 is 54419782.

It can be written as a sum of positive squares in 4 ways, for example, as 7474756 + 21316689 = 2734^2 + 4617^2 .

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 28791445 - 2⁷ = 28791317 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28791398 and 28791407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28791449) 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, 17554 + ... + 19123.

It is an arithmetic number, because the mean of its divisors is an integer number (4346343).

Almost surely, 2^28791445 is an apocalyptic number.

It is an amenable number.

28791445 is a deficient number, since it is larger than the sum of its proper divisors (5979299).

28791445 is a wasteful number, since it uses less digits than its factorization.

28791445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36839.

The product of its digits is 80640, while the sum is 40.

The square root of 28791445 is about 5365.7660217345. The cubic root of 28791445 is about 306.4934191314.

The spelling of 28791445 in words is "twenty-eight million, seven hundred ninety-one thousand, four hundred forty-five".