28445775 has 12 divisors (see below), whose sum is σ = 47030472. Its totient is φ = 15171040.

The previous prime is 28445773. The next prime is 28445783. The reversal of 28445775 is 57754482.

It is not a de Polignac number, because 28445775 - 2¹ = 28445773 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28445771) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 189564 + ... + 189713.

It is an arithmetic number, because the mean of its divisors is an integer number (3919206).

Almost surely, 2^28445775 is an apocalyptic number.

28445775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28445775 is a deficient number, since it is larger than the sum of its proper divisors (18584697).

28445775 is a wasteful number, since it uses less digits than its factorization.

28445775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379290 (or 379285 counting only the distinct ones).

The product of its digits is 313600, while the sum is 42.

The square root of 28445775 is about 5333.4580714580. The cubic root of 28445775 is about 305.2618909793.

The spelling of 28445775 in words is "twenty-eight million, four hundred forty-five thousand, seven hundred seventy-five".