28025920 has 56 divisors (see below), whose sum is σ = 71880984. Its totient is φ = 10346496.

The previous prime is 28025917. The next prime is 28025927. The reversal of 28025920 is 2952082.

It can be written as a sum of positive squares in 4 ways, for example, as 484416 + 27541504 = 696^2 + 5248^2 .

It is not an unprimeable number, because it can be changed into a prime (28025927) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 792 + ... + 7528.

It is an arithmetic number, because the mean of its divisors is an integer number (1283589).

Almost surely, 2^28025920 is an apocalyptic number.

28025920 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 28025920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35940492).

28025920 is an abundant number, since it is smaller than the sum of its proper divisors (43855064).

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

28025920 is a wasteful number, since it uses less digits than its factorization.

28025920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6767 (or 6757 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 28025920 is about 5293.9512653594. The cubic root of 28025920 is about 303.7525687488.

The spelling of 28025920 in words is "twenty-eight million, twenty-five thousand, nine hundred twenty".