28573320 has 64 divisors (see below), whose sum is σ = 88496640. Its totient is φ = 7372800.

The previous prime is 28573319. The next prime is 28573357. The reversal of 28573320 is 2337582.

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

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 121 + ... + 7560.

It is an arithmetic number, because the mean of its divisors is an integer number (1382760).

Almost surely, 2^28573320 is an apocalyptic number.

28573320 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 28573320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44248320).

28573320 is an abundant number, since it is smaller than the sum of its proper divisors (59923320).

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

28573320 is a wasteful number, since it uses less digits than its factorization.

28573320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7726 (or 7722 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 30.

The square root of 28573320 is about 5345.4017622626. The cubic root of 28573320 is about 305.7174546003.

The spelling of 28573320 in words is "twenty-eight million, five hundred seventy-three thousand, three hundred twenty".