28205034 has 64 divisors (see below), whose sum is σ = 67350528. Its totient is φ = 7761600.

The previous prime is 28205027. The next prime is 28205039. The reversal of 28205034 is 43050282.

It is a super-3 number, since 3×28205034³ (a number of 23 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28204995 and 28205013.

It is not an unprimeable number, because it can be changed into a prime (28205039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 60687 + ... + 61149.

It is an arithmetic number, because the mean of its divisors is an integer number (1052352).

Almost surely, 2^28205034 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28205034, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33675264).

28205034 is an abundant number, since it is smaller than the sum of its proper divisors (39145494).

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

28205034 is a wasteful number, since it uses less digits than its factorization.

28205034 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 563.

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 28205034 is about 5310.8411763110. The cubic root of 28205034 is about 304.3982905606.

The spelling of 28205034 in words is "twenty-eight million, two hundred five thousand, thirty-four".