28195308 has 72 divisors (see below), whose sum is σ = 74692800. Its totient is φ = 8956416.

The previous prime is 28195303. The next prime is 28195319. The reversal of 28195308 is 80359182.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28195303) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 117853 + ... + 118091.

It is an arithmetic number, because the mean of its divisors is an integer number (1037400).

Almost surely, 2^28195308 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 28195308, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37346400).

28195308 is an abundant number, since it is smaller than the sum of its proper divisors (46497492).

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

28195308 is a wasteful number, since it uses less digits than its factorization.

28195308 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391 (or 386 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 28195308 is about 5309.9254232051. The cubic root of 28195308 is about 304.3632977748.

The spelling of 28195308 in words is "twenty-eight million, one hundred ninety-five thousand, three hundred eight".