28445120 has 56 divisors (see below), whose sum is σ = 73901808. Its totient is φ = 10342400.

The previous prime is 28445117. The next prime is 28445129. The reversal of 28445120 is 2154482.

It is a happy number.

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 28445120.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28445129) 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, 521 + ... + 7560.

Almost surely, 2^28445120 is an apocalyptic number.

28445120 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 28445120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36950904).

28445120 is an abundant number, since it is smaller than the sum of its proper divisors (45456688).

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

28445120 is a wasteful number, since it uses less digits than its factorization.

28445120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8109 (or 8099 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 26.

The square root of 28445120 is about 5333.3966662906. The cubic root of 28445120 is about 305.2595479474.

The spelling of 28445120 in words is "twenty-eight million, four hundred forty-five thousand, one hundred twenty".