28335390 has 64 divisors (see below), whose sum is σ = 70543872. Its totient is φ = 7280000.

The previous prime is 28335389. The next prime is 28335421. The reversal of 28335390 is 9353382.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 112765 + ... + 113015.

It is an arithmetic number, because the mean of its divisors is an integer number (1102248).

Almost surely, 2^28335390 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28335390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35271936).

28335390 is an abundant number, since it is smaller than the sum of its proper divisors (42208482).

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

28335390 is a wasteful number, since it uses less digits than its factorization.

28335390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385.

The product of its (nonzero) digits is 19440, while the sum is 33.

The square root of 28335390 is about 5323.0996609119. The cubic root of 28335390 is about 304.8665186763.

The spelling of 28335390 in words is "twenty-eight million, three hundred thirty-five thousand, three hundred ninety".