28113820 has 48 divisors (see below), whose sum is σ = 70414848. Its totient is φ = 9218880.

The previous prime is 28113793. The next prime is 28113829. The reversal of 28113820 is 2831182.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28113829) 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, 1146 + ... + 7585.

It is an arithmetic number, because the mean of its divisors is an integer number (1466976).

Almost surely, 2^28113820 is an apocalyptic number.

28113820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28113820 is an abundant number, since it is smaller than the sum of its proper divisors (42301028).

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

28113820 is a wasteful number, since it uses less digits than its factorization.

28113820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8770 (or 8768 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 28113820 is about 5302.2466936196. The cubic root of 28113820 is about 304.0697987236.

The spelling of 28113820 in words is "twenty-eight million, one hundred thirteen thousand, eight hundred twenty".