28427520 has 144 divisors (see below), whose sum is σ = 99191232. Its totient is φ = 6881280.

The previous prime is 28427513. The next prime is 28427543. The reversal of 28427520 is 2572482.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41904 + ... + 42576.

It is an arithmetic number, because the mean of its divisors is an integer number (688828).

Almost surely, 2^28427520 is an apocalyptic number.

28427520 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 28427520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49595616).

28427520 is an abundant number, since it is smaller than the sum of its proper divisors (70763712).

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

28427520 is a wasteful number, since it uses less digits than its factorization.

28427520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 708 (or 694 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 30.

The square root of 28427520 is about 5331.7464305798. The cubic root of 28427520 is about 305.1965766716.

The spelling of 28427520 in words is "twenty-eight million, four hundred twenty-seven thousand, five hundred twenty".