28295820 has 144 divisors (see below), whose sum is σ = 103940928. Its totient is φ = 6082560.

The previous prime is 28295789. The next prime is 28295821. The reversal of 28295820 is 2859282.

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

It is not an unprimeable number, because it can be changed into a prime (28295821) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 20760 + ... + 22080.

It is an arithmetic number, because the mean of its divisors is an integer number (721812).

Almost surely, 2^28295820 is an apocalyptic number.

28295820 is a gapful number since it is divisible by the number (20) 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 28295820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51970464).

28295820 is an abundant number, since it is smaller than the sum of its proper divisors (75645108).

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

28295820 is a wasteful number, since it uses less digits than its factorization.

28295820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1360 (or 1355 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 28295820 is about 5319.3815429991. The cubic root of 28295820 is about 304.7245385348.

It can be divided in two parts, 2829 and 5820, that added together give a square (8649 = 93²).

The spelling of 28295820 in words is "twenty-eight million, two hundred ninety-five thousand, eight hundred twenty".