28235520 has 288 divisors, whose sum is σ = 107923200. Its totient is φ = 6967296.

The previous prime is 28235509. The next prime is 28235527. The reversal of 28235520 is 2553282.

It is a tau number, because it is divible by the number of its divisors (288).

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28235527) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 656619 + ... + 656661.

Almost surely, 2^28235520 is an apocalyptic number.

28235520 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 28235520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53961600).

28235520 is an abundant number, since it is smaller than the sum of its proper divisors (79687680).

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

28235520 is a wasteful number, since it uses less digits than its factorization.

28235520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92 (or 72 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 28235520 is about 5313.7105679553. The cubic root of 28235520 is about 304.5079228204.

The spelling of 28235520 in words is "twenty-eight million, two hundred thirty-five thousand, five hundred twenty".