28045446 has 32 divisors (see below), whose sum is σ = 65899008. Its totient is φ = 7844640.

The previous prime is 28045403. The next prime is 28045447. The reversal of 28045446 is 64454082.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28045447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15486 + ... + 17201.

It is an arithmetic number, because the mean of its divisors is an integer number (2059344).

Almost surely, 2^28045446 is an apocalyptic number.

28045446 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

28045446 is an abundant number, since it is smaller than the sum of its proper divisors (37853562).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28045446 is a wasteful number, since it uses less digits than its factorization.

28045446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32716.

The product of its (nonzero) digits is 30720, while the sum is 33.

The square root of 28045446 is about 5295.7951244360. The cubic root of 28045446 is about 303.8230950780.

The spelling of 28045446 in words is "twenty-eight million, forty-five thousand, four hundred forty-six".