28408520 has 64 divisors (see below), whose sum is σ = 74131200. Its totient is φ = 9596160.

The previous prime is 28408517. The next prime is 28408571. The reversal of 28408520 is 2580482.

28408520 is a modest number, since divided by 8520 gives 2840 as remainder.

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, 19166 + ... + 20594.

It is an arithmetic number, because the mean of its divisors is an integer number (1158300).

Almost surely, 2^28408520 is an apocalyptic number.

28408520 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 28408520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37065600).

28408520 is an abundant number, since it is smaller than the sum of its proper divisors (45722680).

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

28408520 is a wasteful number, since it uses less digits than its factorization.

28408520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1518 (or 1514 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 29.

The square root of 28408520 is about 5329.9643526012. The cubic root of 28408520 is about 305.1285671356.

The spelling of 28408520 in words is "twenty-eight million, four hundred eight thousand, five hundred twenty".