28445928 has 32 divisors (see below), whose sum is σ = 81274560. Its totient is φ = 8127360.

The previous prime is 28445899. The next prime is 28445939. The reversal of 28445928 is 82954482.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 28445928.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 84493 + ... + 84828.

It is an arithmetic number, because the mean of its divisors is an integer number (2539830).

Almost surely, 2^28445928 is an apocalyptic number.

28445928 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

28445928 is an abundant number, since it is smaller than the sum of its proper divisors (52828632).

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

28445928 is a wasteful number, since it uses less digits than its factorization.

28445928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169337 (or 169333 counting only the distinct ones).

The product of its digits is 184320, while the sum is 42.

The square root of 28445928 is about 5333.4724148532. The cubic root of 28445928 is about 305.2624382777.

The spelling of 28445928 in words is "twenty-eight million, four hundred forty-five thousand, nine hundred twenty-eight".