28925280 has 144 divisors (see below), whose sum is σ = 100835280. Its totient is φ = 7547904.

The previous prime is 28925261. The next prime is 28925287. The reversal of 28925280 is 8252982.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28925287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 76131 + ... + 76509.

It is an arithmetic number, because the mean of its divisors is an integer number (700245).

Almost surely, 2^28925280 is an apocalyptic number.

28925280 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 28925280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50417640).

28925280 is an abundant number, since it is smaller than the sum of its proper divisors (71910000).

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

28925280 is a wasteful number, since it uses less digits than its factorization.

28925280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 453 (or 442 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 28925280 is about 5378.2227547769. Note that the first 3 decimals coincide. The cubic root of 28925280 is about 306.9675895149.

The spelling of 28925280 in words is "twenty-eight million, nine hundred twenty-five thousand, two hundred eighty".