28381892 has 48 divisors (see below), whose sum is σ = 63393792. Its totient is φ = 10795680.

The previous prime is 28381883. The next prime is 28381907. The reversal of 28381892 is 29818382.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12173 + ... + 14315.

It is an arithmetic number, because the mean of its divisors is an integer number (1320704).

Almost surely, 2^28381892 is an apocalyptic number.

28381892 is a gapful number since it is divisible by the number (22) 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 28381892, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31696896).

28381892 is an abundant number, since it is smaller than the sum of its proper divisors (35011900).

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

28381892 is a wasteful number, since it uses less digits than its factorization.

28381892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2208 (or 2206 counting only the distinct ones).

The product of its digits is 55296, while the sum is 41.

The square root of 28381892 is about 5327.4658140621. The cubic root of 28381892 is about 305.0332025128.

The spelling of 28381892 in words is "twenty-eight million, three hundred eighty-one thousand, eight hundred ninety-two".