28831320 has 192 divisors, whose sum is σ = 113555520. Its totient is φ = 6193152.

The previous prime is 28831301. The next prime is 28831321. The reversal of 28831320 is 2313882.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28831321) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 42504 + ... + 43176.

It is an arithmetic number, because the mean of its divisors is an integer number (591435).

Almost surely, 2^28831320 is an apocalyptic number.

28831320 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 28831320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (56777760).

28831320 is an abundant number, since it is smaller than the sum of its proper divisors (84724200).

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

28831320 is a wasteful number, since it uses less digits than its factorization.

28831320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 714 (or 707 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 28831320 is about 5369.4804217913. The cubic root of 28831320 is about 306.6348475703.

The spelling of 28831320 in words is "twenty-eight million, eight hundred thirty-one thousand, three hundred twenty".