28445105 has 16 divisors (see below), whose sum is σ = 37545984. Its totient is φ = 20556480.

The previous prime is 28445101. The next prime is 28445111. The reversal of 28445105 is 50154482.

It is not a de Polignac number, because 28445105 - 2² = 28445101 is a prime.

It is a super-2 number, since 2×28445105² = 1618247996922050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28445101) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1601 + ... + 7710.

It is an arithmetic number, because the mean of its divisors is an integer number (2346624).

Almost surely, 2^28445105 is an apocalyptic number.

It is an amenable number.

28445105 is a deficient number, since it is larger than the sum of its proper divisors (9100879).

28445105 is a wasteful number, since it uses less digits than its factorization.

28445105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9376.

The product of its (nonzero) digits is 6400, while the sum is 29.

The square root of 28445105 is about 5333.3952600571. The cubic root of 28445105 is about 305.2594942897.

Adding to 28445105 its reverse (50154482), we get a palindrome (78599587).

The spelling of 28445105 in words is "twenty-eight million, four hundred forty-five thousand, one hundred five".