28201420 has 48 divisors (see below), whose sum is σ = 64632960. Its totient is φ = 10273536.

The previous prime is 28201417. The next prime is 28201451. The reversal of 28201420 is 2410282.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19854 + ... + 21226.

It is an arithmetic number, because the mean of its divisors is an integer number (1346520).

Almost surely, 2^28201420 is an apocalyptic number.

28201420 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 28201420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32316480).

28201420 is an abundant number, since it is smaller than the sum of its proper divisors (36431540).

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

28201420 is a wasteful number, since it uses less digits than its factorization.

28201420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1474 (or 1472 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 28201420 is about 5310.5009179926. The cubic root of 28201420 is about 304.3852888342.

The spelling of 28201420 in words is "twenty-eight million, two hundred one thousand, four hundred twenty".