28725504 has 72 divisors (see below), whose sum is σ = 77361312. Its totient is φ = 9461760.

The previous prime is 28725497. The next prime is 28725517. The reversal of 28725504 is 40552782.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86619 + ... + 86949.

Almost surely, 2^28725504 is an apocalyptic number.

28725504 is a gapful number since it is divisible by the number (24) 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 28725504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38680656).

28725504 is an abundant number, since it is smaller than the sum of its proper divisors (48635808).

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

28725504 is a wasteful number, since it uses less digits than its factorization.

28725504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 463 (or 449 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 33.

The square root of 28725504 is about 5359.6178968281. The cubic root of 28725504 is about 306.2592531426.

The spelling of 28725504 in words is "twenty-eight million, seven hundred twenty-five thousand, five hundred four".