28825440 has 192 divisors, whose sum is σ = 108573696. Its totient is φ = 6285312.

The previous prime is 28825427. The next prime is 28825469. The reversal of 28825440 is 4452882.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 77094 + ... + 77466.

It is an arithmetic number, because the mean of its divisors is an integer number (565488).

Almost surely, 2^28825440 is an apocalyptic number.

28825440 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 28825440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54286848).

28825440 is an abundant number, since it is smaller than the sum of its proper divisors (79748256).

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

28825440 is a wasteful number, since it uses less digits than its factorization.

28825440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421 (or 413 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 33.

The square root of 28825440 is about 5368.9328548605. The cubic root of 28825440 is about 306.6140006176.

The spelling of 28825440 in words is "twenty-eight million, eight hundred twenty-five thousand, four hundred forty".