28213380 has 96 divisors (see below), whose sum is σ = 94550400. Its totient is φ = 6943104.

The previous prime is 28213373. The next prime is 28213391. The reversal of 28213380 is 8331282.

28213380 is a `hidden beast` number, since 282 + 1 + 3 + 380 = 666.

It is a super-2 number, since 2×28213380² = 1591989622048800, which contains 22 as substring.

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

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, 5011 + ... + 9029.

It is an arithmetic number, because the mean of its divisors is an integer number (984900).

Almost surely, 2^28213380 is an apocalyptic number.

28213380 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 28213380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47275200).

28213380 is an abundant number, since it is smaller than the sum of its proper divisors (66337020).

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

28213380 is a wasteful number, since it uses less digits than its factorization.

28213380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4050 (or 4042 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 28213380 is about 5311.6268694252. The cubic root of 28213380 is about 304.4283118870.

The spelling of 28213380 in words is "twenty-eight million, two hundred thirteen thousand, three hundred eighty".