28364820 has 72 divisors (see below), whose sum is σ = 87320352. Its totient is φ = 6874560.

The previous prime is 28364797. The next prime is 28364839. The reversal of 28364820 is 2846382.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5307 + ... + 9213.

Almost surely, 2^28364820 is an apocalyptic number.

28364820 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 28364820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43660176).

28364820 is an abundant number, since it is smaller than the sum of its proper divisors (58955532).

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

28364820 is a wasteful number, since it uses less digits than its factorization.

28364820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3941 (or 3928 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 33.

The square root of 28364820 is about 5325.8633103000. The cubic root of 28364820 is about 304.9720300428.

The spelling of 28364820 in words is "twenty-eight million, three hundred sixty-four thousand, eight hundred twenty".