28163520 has 336 divisors, whose sum is σ = 121724928. Its totient is φ = 5806080.

The previous prime is 28163503. The next prime is 28163537. The reversal of 28163520 is 2536182.

28163520 is a `hidden beast` number, since 2 + 8 + 1 + 635 + 20 = 666.

It is an interprime number because it is at equal distance from previous prime (28163503) and next prime (28163537).

It is a tau number, because it is divible by the number of its divisors (336).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 221697 + ... + 221823.

Almost surely, 2^28163520 is an apocalyptic number.

28163520 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 28163520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (60862464).

28163520 is an abundant number, since it is smaller than the sum of its proper divisors (93561408).

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

28163520 is a wasteful number, since it uses less digits than its factorization.

28163520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168 (or 155 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 28163520 is about 5306.9313166839. The cubic root of 28163520 is about 304.2488728410.

28163520 divided by its product of nonzero digits (2880) gives a palindrome (9779).

It can be divided in two parts, 2816 and 3520, that added together give a palindrome (6336).

The spelling of 28163520 in words is "twenty-eight million, one hundred sixty-three thousand, five hundred twenty".