28213344 has 72 divisors (see below), whose sum is σ = 80858232. Its totient is φ = 9331200.

The previous prime is 28213343. The next prime is 28213373. The reversal of 28213344 is 44331282.

It is a tau number, because it is divible by the number of its divisors (72).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28213343) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 46644 + ... + 47244.

It is an arithmetic number, because the mean of its divisors is an integer number (1123031).

Almost surely, 2^28213344 is an apocalyptic number.

28213344 is a gapful number since it is divisible by the number (24) 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 28213344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40429116).

28213344 is an abundant number, since it is smaller than the sum of its proper divisors (52644888).

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

28213344 is a wasteful number, since it uses less digits than its factorization.

28213344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 780 (or 769 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

The square root of 28213344 is about 5311.6234806319. The cubic root of 28213344 is about 304.4281824044.

The spelling of 28213344 in words is "twenty-eight million, two hundred thirteen thousand, three hundred forty-four".