28312980 has 48 divisors (see below), whose sum is σ = 79833600. Its totient is φ = 7497088.

The previous prime is 28312957. The next prime is 28312981. The reversal of 28312980 is 8921382.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28312981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7357 + ... + 10523.

It is an arithmetic number, because the mean of its divisors is an integer number (1663200).

Almost surely, 2^28312980 is an apocalyptic number.

28312980 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 28312980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39916800).

28312980 is an abundant number, since it is smaller than the sum of its proper divisors (51520620).

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

28312980 is a wasteful number, since it uses less digits than its factorization.

28312980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3328 (or 3326 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 28312980 is about 5320.9942679917. The cubic root of 28312980 is about 304.7861261519.

It can be divided in two parts, 28312 and 980, that added together give a palindrome (29292).

The spelling of 28312980 in words is "twenty-eight million, three hundred twelve thousand, nine hundred eighty".