28308528 has 80 divisors (see below), whose sum is σ = 82360800. Its totient is φ = 9424512.

The previous prime is 28308521. The next prime is 28308529. The reversal of 28308528 is 82580382.

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 = 28308492 and 28308501.

It is not an unprimeable number, because it can be changed into a prime (28308521) 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, 34588 + ... + 35396.

It is an arithmetic number, because the mean of its divisors is an integer number (1029510).

Almost surely, 2^28308528 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 28308528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41180400).

28308528 is an abundant number, since it is smaller than the sum of its proper divisors (54052272).

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

28308528 is an frugal number, since it uses more digits than its factorization.

28308528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 838 (or 814 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 36.

The square root of 28308528 is about 5320.5759086776. The cubic root of 28308528 is about 304.7701502171.

The spelling of 28308528 in words is "twenty-eight million, three hundred eight thousand, five hundred twenty-eight".