28323020 has 48 divisors (see below), whose sum is σ = 68711328. Its totient is φ = 9692160.

The previous prime is 28323011. The next prime is 28323047. The reversal of 28323020 is 2032382.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 28322983 and 28323001.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 47 + ... + 7526.

It is an arithmetic number, because the mean of its divisors is an integer number (1431486).

Almost surely, 2^28323020 is an apocalyptic number.

28323020 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 28323020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34355664).

28323020 is an abundant number, since it is smaller than the sum of its proper divisors (40388308).

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

28323020 is a wasteful number, since it uses less digits than its factorization.

28323020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7610 (or 7608 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 28323020 is about 5321.9376170714. The cubic root of 28323020 is about 304.8221483941.

The spelling of 28323020 in words is "twenty-eight million, three hundred twenty-three thousand, twenty".