28322730 has 64 divisors (see below), whose sum is σ = 79516800. Its totient is φ = 7153920.

The previous prime is 28322719. The next prime is 28322743. The reversal of 28322730 is 3722382.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 28322694 and 28322703.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2370 + ... + 7890.

It is an arithmetic number, because the mean of its divisors is an integer number (1242450).

Almost surely, 2^28322730 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28322730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39758400).

28322730 is an abundant number, since it is smaller than the sum of its proper divisors (51194070).

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

28322730 is a wasteful number, since it uses less digits than its factorization.

28322730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5556 (or 5550 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 28322730 is about 5321.9103712859. The cubic root of 28322730 is about 304.8211080304.

The spelling of 28322730 in words is "twenty-eight million, three hundred twenty-two thousand, seven hundred thirty".