28328920 has 16 divisors (see below), whose sum is σ = 63740160. Its totient is φ = 11331552.

The previous prime is 28328917. The next prime is 28328933. The reversal of 28328920 is 2982382.

It is a happy number.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 354072 + ... + 354151.

It is an arithmetic number, because the mean of its divisors is an integer number (3983760).

Almost surely, 2^28328920 is an apocalyptic number.

28328920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28328920 is an abundant number, since it is smaller than the sum of its proper divisors (35411240).

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

28328920 is a wasteful number, since it uses less digits than its factorization.

28328920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 708234 (or 708230 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 28328920 is about 5322.4918975983. The cubic root of 28328920 is about 304.8433128722.

The spelling of 28328920 in words is "twenty-eight million, three hundred twenty-eight thousand, nine hundred twenty".