28449845 has 8 divisors (see below), whose sum is σ = 34263000. Its totient is φ = 22677760.

The previous prime is 28449833. The next prime is 28449871. The reversal of 28449845 is 54894482.

It can be written as a sum of positive squares in 4 ways, for example, as 2582449 + 25867396 = 1607^2 + 5086^2 .

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

It is not a de Polignac number, because 28449845 - 2¹² = 28445749 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 28449796 and 28449805.

It is a congruent number.

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, 8720 + ... + 11529.

It is an arithmetic number, because the mean of its divisors is an integer number (4282875).

Almost surely, 2^28449845 is an apocalyptic number.

It is an amenable number.

28449845 is a deficient number, since it is larger than the sum of its proper divisors (5813155).

28449845 is a wasteful number, since it uses less digits than its factorization.

28449845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20535.

The product of its digits is 368640, while the sum is 44.

The square root of 28449845 is about 5333.8396113869. The cubic root of 28449845 is about 305.2764491652.

The spelling of 28449845 in words is "twenty-eight million, four hundred forty-nine thousand, eight hundred forty-five".