28328592 has 80 divisors (see below), whose sum is σ = 77495040. Its totient is φ = 8902656.

The previous prime is 28328591. The next prime is 28328623. The reversal of 28328592 is 29582382.

It is a self number, because there is not a number n which added to its sum of digits gives 28328592.

It is not an unprimeable number, because it can be changed into a prime (28328591) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65208 + ... + 65640.

It is an arithmetic number, because the mean of its divisors is an integer number (968688).

Almost surely, 2^28328592 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 28328592, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38747520).

28328592 is an abundant number, since it is smaller than the sum of its proper divisors (49166448).

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

28328592 is a wasteful number, since it uses less digits than its factorization.

28328592 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520 (or 514 counting only the distinct ones).

The product of its digits is 69120, while the sum is 39.

The square root of 28328592 is about 5322.4610848742. The cubic root of 28328592 is about 304.8421363479.

It can be divided in two parts, 28328 and 592, that added together give a triangular number (28920 = T₂₄₀).

The spelling of 28328592 in words is "twenty-eight million, three hundred twenty-eight thousand, five hundred ninety-two".