28213332 has 96 divisors (see below), whose sum is σ = 78769152. Its totient is φ = 7693056.

The previous prime is 28213327. The next prime is 28213337. The reversal of 28213332 is 23331282.

It is an interprime number because it is at equal distance from previous prime (28213327) and next prime (28213337).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28213337) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 263623 + ... + 263729.

It is an arithmetic number, because the mean of its divisors is an integer number (820512).

Almost surely, 2^28213332 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28213332, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39384576).

28213332 is an abundant number, since it is smaller than the sum of its proper divisors (50555820).

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

28213332 is a wasteful number, since it uses less digits than its factorization.

28213332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237 (or 235 counting only the distinct ones).

The product of its digits is 1728, while the sum is 24.

The square root of 28213332 is about 5311.6223510336. The cubic root of 28213332 is about 304.4281392435.

The spelling of 28213332 in words is "twenty-eight million, two hundred thirteen thousand, three hundred thirty-two".