28457520 has 160 divisors (see below), whose sum is σ = 108659712. Its totient is φ = 5999616.

The previous prime is 28457501. The next prime is 28457531. The reversal of 28457520 is 2575482.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21189 + ... + 22491.

Almost surely, 2^28457520 is an apocalyptic number.

28457520 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 28457520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54329856).

28457520 is an abundant number, since it is smaller than the sum of its proper divisors (80202192).

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

28457520 is a wasteful number, since it uses less digits than its factorization.

28457520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1339 (or 1333 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 33.

The square root of 28457520 is about 5334.5590258240. The cubic root of 28457520 is about 305.3038984781.

The spelling of 28457520 in words is "twenty-eight million, four hundred fifty-seven thousand, five hundred twenty".