28731528 has 96 divisors (see below), whose sum is σ = 89918400. Its totient is φ = 8118144.

The previous prime is 28731517. The next prime is 28731551. The reversal of 28731528 is 82513782.

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 = 28731492 and 28731501.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 54675 + ... + 55197.

It is an arithmetic number, because the mean of its divisors is an integer number (936650).

Almost surely, 2^28731528 is an apocalyptic number.

28731528 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 28731528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44959200).

28731528 is an abundant number, since it is smaller than the sum of its proper divisors (61186872).

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

28731528 is a wasteful number, since it uses less digits than its factorization.

28731528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 651 (or 644 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

The square root of 28731528 is about 5360.1798477290. The cubic root of 28731528 is about 306.2806600985.

The spelling of 28731528 in words is "twenty-eight million, seven hundred thirty-one thousand, five hundred twenty-eight".