28020380 has 24 divisors (see below), whose sum is σ = 60873120. Its totient is φ = 10821440.

The previous prime is 28020379. The next prime is 28020397. The reversal of 28020380 is 8302082.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23576 + ... + 24735.

It is an arithmetic number, because the mean of its divisors is an integer number (2536380).

Almost surely, 2^28020380 is an apocalyptic number.

28020380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28020380 is an abundant number, since it is smaller than the sum of its proper divisors (32852740).

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

28020380 is a wasteful number, since it uses less digits than its factorization.

28020380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48349 (or 48347 counting only the distinct ones).

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

The square root of 28020380 is about 5293.4280008327. The cubic root of 28020380 is about 303.7325527526.

The spelling of 28020380 in words is "twenty-eight million, twenty thousand, three hundred eighty".