28028592 has 100 divisors (see below), whose sum is σ = 82371960. Its totient is φ = 9237888.

The previous prime is 28028549. The next prime is 28028593. The reversal of 28028592 is 29582082.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (28028593) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 314884 + ... + 314972.

Almost surely, 2^28028592 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 28028592, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41185980).

28028592 is an abundant number, since it is smaller than the sum of its proper divisors (54343368).

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

28028592 is an frugal number, since it uses more digits than its factorization.

28028592 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124 (or 94 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 28028592 is about 5294.2036228313. The cubic root of 28028592 is about 303.7622217305.

The spelling of 28028592 in words is "twenty-eight million, twenty-eight thousand, five hundred ninety-two".