28575240 has 128 divisors (see below), whose sum is σ = 91929600. Its totient is φ = 7084800.

The previous prime is 28575233. The next prime is 28575251. The reversal of 28575240 is 4257582.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 189165 + ... + 189315.

It is an arithmetic number, because the mean of its divisors is an integer number (718200).

Almost surely, 2^28575240 is an apocalyptic number.

28575240 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 28575240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45964800).

28575240 is an abundant number, since it is smaller than the sum of its proper divisors (63354360).

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

28575240 is a wasteful number, since it uses less digits than its factorization.

28575240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267 (or 263 counting only the distinct ones).

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

The square root of 28575240 is about 5345.5813528558. The cubic root of 28575240 is about 305.7243020646.

The spelling of 28575240 in words is "twenty-eight million, five hundred seventy-five thousand, two hundred forty".