28030820 has 48 divisors (see below), whose sum is σ = 62899200. Its totient is φ = 10469760.

The previous prime is 28030811. The next prime is 28030823. The reversal of 28030820 is 2803082.

It is not an unprimeable number, because it can be changed into a prime (28030823) 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, 17201 + ... + 18759.

It is an arithmetic number, because the mean of its divisors is an integer number (1310400).

Almost surely, 2^28030820 is an apocalyptic number.

28030820 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 28030820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31449600).

28030820 is an abundant number, since it is smaller than the sum of its proper divisors (34868380).

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

28030820 is a wasteful number, since it uses less digits than its factorization.

28030820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1628 (or 1626 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 28030820 is about 5294.4140374549. The cubic root of 28030820 is about 303.7702702296.

The spelling of 28030820 in words is "twenty-eight million, thirty thousand, eight hundred twenty".