28653820 has 48 divisors (see below), whose sum is σ = 65253888. Its totient is φ = 10506240.

The previous prime is 28653809. The next prime is 28653829. The reversal of 28653820 is 2835682.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28653829) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49372 + ... + 49948.

It is an arithmetic number, because the mean of its divisors is an integer number (1359456).

Almost surely, 2^28653820 is an apocalyptic number.

28653820 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 28653820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32626944).

28653820 is an abundant number, since it is smaller than the sum of its proper divisors (36600068).

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

28653820 is a wasteful number, since it uses less digits than its factorization.

28653820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 790 (or 788 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 34.

The square root of 28653820 is about 5352.9263025003. The cubic root of 28653820 is about 306.0042860408.

The spelling of 28653820 in words is "twenty-eight million, six hundred fifty-three thousand, eight hundred twenty".