28065520 has 80 divisors (see below), whose sum is σ = 77852160. Its totient is φ = 9199872.

The previous prime is 28065517. The next prime is 28065523. The reversal of 28065520 is 2556082.

It is an interprime number because it is at equal distance from previous prime (28065517) and next prime (28065523).

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28065523) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11791 + ... + 13969.

It is an arithmetic number, because the mean of its divisors is an integer number (973152).

Almost surely, 2^28065520 is an apocalyptic number.

28065520 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 28065520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38926080).

28065520 is an abundant number, since it is smaller than the sum of its proper divisors (49786640).

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

28065520 is a wasteful number, since it uses less digits than its factorization.

28065520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2222 (or 2216 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 28065520 is about 5297.6900626594. The cubic root of 28065520 is about 303.8955666211.

The spelling of 28065520 in words is "twenty-eight million, sixty-five thousand, five hundred twenty".