28999320 has 256 divisors, whose sum is σ = 110592000. Its totient is φ = 5930496.

The previous prime is 28999319. The next prime is 28999337. The reversal of 28999320 is 2399982.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 367041 + ... + 367119.

It is an arithmetic number, because the mean of its divisors is an integer number (432000).

Almost surely, 2^28999320 is an apocalyptic number.

28999320 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 28999320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (55296000).

28999320 is an abundant number, since it is smaller than the sum of its proper divisors (81592680).

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

28999320 is a wasteful number, since it uses less digits than its factorization.

28999320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142 (or 138 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 42.

The square root of 28999320 is about 5385.1016703494. The cubic root of 28999320 is about 307.2292811987.

The spelling of 28999320 in words is "twenty-eight million, nine hundred ninety-nine thousand, three hundred twenty".