28520424 has 96 divisors (see below), whose sum is σ = 84913920. Its totient is φ = 8937216.

The previous prime is 28520419. The next prime is 28520447. The reversal of 28520424 is 42402582.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 32617 + ... + 33479.

It is an arithmetic number, because the mean of its divisors is an integer number (884520).

Almost surely, 2^28520424 is an apocalyptic number.

28520424 is a gapful number since it is divisible by the number (24) 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 28520424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42456960).

28520424 is an abundant number, since it is smaller than the sum of its proper divisors (56393496).

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

28520424 is a wasteful number, since it uses less digits than its factorization.

28520424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 901 (or 885 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 27.

The square root of 28520424 is about 5340.4516662919. The cubic root of 28520424 is about 305.5286862005.

The spelling of 28520424 in words is "twenty-eight million, five hundred twenty thousand, four hundred twenty-four".