28909760 has 112 divisors (see below), whose sum is σ = 77248512. Its totient is φ = 10214400.

The previous prime is 28909739. The next prime is 28909787. The reversal of 28909760 is 6790982.

28909760 is nontrivially palindromic in base 7.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 151265 + ... + 151455.

Almost surely, 2^28909760 is an apocalyptic number.

28909760 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 28909760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38624256).

28909760 is an abundant number, since it is smaller than the sum of its proper divisors (48338752).

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

28909760 is a wasteful number, since it uses less digits than its factorization.

28909760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262 (or 252 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 28909760 is about 5376.7797053627. The cubic root of 28909760 is about 306.9126780405.

The spelling of 28909760 in words is "twenty-eight million, nine hundred nine thousand, seven hundred sixty".