28982720 has 56 divisors (see below), whose sum is σ = 74334624. Its totient is φ = 10699776.

The previous prime is 28982713. The next prime is 28982741. The reversal of 28982720 is 2728982.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 677 + ... + 7643.

It is an arithmetic number, because the mean of its divisors is an integer number (1327404).

Almost surely, 2^28982720 is an apocalyptic number.

28982720 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 28982720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37167312).

28982720 is an abundant number, since it is smaller than the sum of its proper divisors (45351904).

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

28982720 is a wasteful number, since it uses less digits than its factorization.

28982720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6997 (or 6987 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 28982720 is about 5383.5601603400. The cubic root of 28982720 is about 307.1706478756.

The spelling of 28982720 in words is "twenty-eight million, nine hundred eighty-two thousand, seven hundred twenty".