28726530 has 128 divisors (see below), whose sum is σ = 83980800. Its totient is φ = 6150144.

The previous prime is 28726513. The next prime is 28726531. The reversal of 28726530 is 3562782.

It is a junction number, because it is equal to n+sod(n) for n = 28726491 and 28726500.

It is not an unprimeable number, because it can be changed into a prime (28726531) by changing a digit.

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 63 ways as a sum of consecutive naturals, for example, 322726 + ... + 322814.

It is an arithmetic number, because the mean of its divisors is an integer number (656100).

Almost surely, 2^28726530 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28726530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41990400).

28726530 is an abundant number, since it is smaller than the sum of its proper divisors (55254270).

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

28726530 is a wasteful number, since it uses less digits than its factorization.

28726530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188.

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 28726530 is about 5359.7136117520. The cubic root of 28726530 is about 306.2628993595.

The spelling of 28726530 in words is "twenty-eight million, seven hundred twenty-six thousand, five hundred thirty".