28405488 has 40 divisors (see below), whose sum is σ = 74044368. Its totient is φ = 9382912.

The previous prime is 28405469. The next prime is 28405493. The reversal of 28405488 is 88450482.

It is a congruent number.

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, 2806 + ... + 8042.

Almost surely, 2^28405488 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28405488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37022184).

28405488 is an abundant number, since it is smaller than the sum of its proper divisors (45638880).

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

28405488 is a wasteful number, since it uses less digits than its factorization.

28405488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5361 (or 5355 counting only the distinct ones).

The product of its (nonzero) digits is 81920, while the sum is 39.

The square root of 28405488 is about 5329.6799153420. The cubic root of 28405488 is about 305.1177114401.

The spelling of 28405488 in words is "twenty-eight million, four hundred five thousand, four hundred eighty-eight".