28344330 has 80 divisors (see below), whose sum is σ = 87120000. Its totient is φ = 6477408.

The previous prime is 28344319. The next prime is 28344343. The reversal of 28344330 is 3344382.

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

It is a junction number, because it is equal to n+sod(n) for n = 28344294 and 28344303.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 3171 + ... + 8169.

It is an arithmetic number, because the mean of its divisors is an integer number (1089000).

Almost surely, 2^28344330 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28344330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43560000).

28344330 is an abundant number, since it is smaller than the sum of its proper divisors (58775670).

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

28344330 is a wasteful number, since it uses less digits than its factorization.

28344330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5025 (or 5016 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

The square root of 28344330 is about 5323.9393309842. The cubic root of 28344330 is about 304.8985777620.

The spelling of 28344330 in words is "twenty-eight million, three hundred forty-four thousand, three hundred thirty".