28080420 has 72 divisors (see below), whose sum is σ = 81410112. Its totient is φ = 7231680.

The previous prime is 28080397. The next prime is 28080421. The reversal of 28080420 is 2408082.

It is not an unprimeable number, because it can be changed into a prime (28080421) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 57417 + ... + 57903.

It is an arithmetic number, because the mean of its divisors is an integer number (1130696).

Almost surely, 2^28080420 is an apocalyptic number.

28080420 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 28080420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40705056).

28080420 is an abundant number, since it is smaller than the sum of its proper divisors (53329692).

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

28080420 is a wasteful number, since it uses less digits than its factorization.

28080420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 561 (or 528 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 24.

The square root of 28080420 is about 5299.0961493447. The cubic root of 28080420 is about 303.9493365479.

The spelling of 28080420 in words is "twenty-eight million, eighty thousand, four hundred twenty".