28223520 has 96 divisors (see below), whose sum is σ = 95764032. Its totient is φ = 6945792.

The previous prime is 28223513. The next prime is 28223527. The reversal of 28223520 is 2532282.

It is an interprime number because it is at equal distance from previous prime (28223513) and next prime (28223527).

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (28223527) 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, 3979 + ... + 8501.

It is an arithmetic number, because the mean of its divisors is an integer number (997542).

Almost surely, 2^28223520 is an apocalyptic number.

28223520 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 28223520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47882016).

28223520 is an abundant number, since it is smaller than the sum of its proper divisors (67540512).

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

28223520 is a wasteful number, since it uses less digits than its factorization.

28223520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4554 (or 4546 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 28223520 is about 5312.5812934957. The cubic root of 28223520 is about 304.4647784304.

The spelling of 28223520 in words is "twenty-eight million, two hundred twenty-three thousand, five hundred twenty".