28330680 has 128 divisors (see below), whose sum is σ = 100569600. Its totient is φ = 6246912.

The previous prime is 28330669. The next prime is 28330681. The reversal of 28330680 is 8603382.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28330681) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 23779 + ... + 24941.

It is an arithmetic number, because the mean of its divisors is an integer number (785700).

Almost surely, 2^28330680 is an apocalyptic number.

28330680 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 28330680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50284800).

28330680 is an abundant number, since it is smaller than the sum of its proper divisors (72238920).

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

28330680 is a wasteful number, since it uses less digits than its factorization.

28330680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1213 (or 1209 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 28330680 is about 5322.6572311206. The cubic root of 28330680 is about 304.8496257746.

The spelling of 28330680 in words is "twenty-eight million, three hundred thirty thousand, six hundred eighty".