28033980 has 96 divisors (see below), whose sum is σ = 85499904. Its totient is φ = 6822144.

The previous prime is 28033963. The next prime is 28033991. The reversal of 28033980 is 8933082.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 98919 + ... + 99201.

It is an arithmetic number, because the mean of its divisors is an integer number (890624).

Almost surely, 2^28033980 is an apocalyptic number.

28033980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28033980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42749952).

28033980 is an abundant number, since it is smaller than the sum of its proper divisors (57465924).

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

28033980 is a wasteful number, since it uses less digits than its factorization.

28033980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435 (or 433 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 28033980 is about 5294.7124567818. The cubic root of 28033980 is about 303.7816847843.

The spelling of 28033980 in words is "twenty-eight million, thirty-three thousand, nine hundred eighty".