28420524 has 96 divisors (see below), whose sum is σ = 82252800. Its totient is φ = 8412480.

The previous prime is 28420501. The next prime is 28420531. The reversal of 28420524 is 42502482.

It is a happy number.

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

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 31 ways as a sum of consecutive naturals, for example, 55582 + ... + 56090.

It is an arithmetic number, because the mean of its divisors is an integer number (856800).

Almost surely, 2^28420524 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28420524, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41126400).

28420524 is an abundant number, since it is smaller than the sum of its proper divisors (53832276).

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

28420524 is a wasteful number, since it uses less digits than its factorization.

28420524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 580 (or 572 counting only the distinct ones).

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

The square root of 28420524 is about 5331.0903200002. The cubic root of 28420524 is about 305.1715383703.

The spelling of 28420524 in words is "twenty-eight million, four hundred twenty thousand, five hundred twenty-four".