28819820 has 24 divisors (see below), whose sum is σ = 60773328. Its totient is φ = 11480000.

The previous prime is 28819793. The next prime is 28819829. The reversal of 28819820 is 2891882.

It is not an unprimeable number, because it can be changed into a prime (28819829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2150 + ... + 7890.

It is an arithmetic number, because the mean of its divisors is an integer number (2532222).

Almost surely, 2^28819820 is an apocalyptic number.

28819820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28819820 is an abundant number, since it is smaller than the sum of its proper divisors (31953508).

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

28819820 is a wasteful number, since it uses less digits than its factorization.

28819820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6001 (or 5999 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 38.

The square root of 28819820 is about 5368.4094478719. The cubic root of 28819820 is about 306.5940728191.

The spelling of 28819820 in words is "twenty-eight million, eight hundred nineteen thousand, eight hundred twenty".