28265328 has 160 divisors (see below), whose sum is σ = 99993600. Its totient is φ = 7444224.

The previous prime is 28265309. The next prime is 28265329. The reversal of 28265328 is 82356282.

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

It is a junction number, because it is equal to n+sod(n) for n = 28265292 and 28265301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28265329) 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, 38953 + ... + 39671.

It is an arithmetic number, because the mean of its divisors is an integer number (624960).

Almost surely, 2^28265328 is an apocalyptic number.

28265328 is a gapful number since it is divisible by the number (28) 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 28265328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49996800).

28265328 is an abundant number, since it is smaller than the sum of its proper divisors (71728272).

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

28265328 is a wasteful number, since it uses less digits than its factorization.

28265328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 756 (or 744 counting only the distinct ones).

The product of its digits is 46080, while the sum is 36.

The square root of 28265328 is about 5316.5146477744. The cubic root of 28265328 is about 304.6150406156.

It can be divided in two parts, 28 and 265328, that added together give a triangular number (265356 = T₇₂₈).

The spelling of 28265328 in words is "twenty-eight million, two hundred sixty-five thousand, three hundred twenty-eight".