28448388 has 24 divisors (see below), whose sum is σ = 73755360. Its totient is φ = 9482760.

The previous prime is 28448369. The next prime is 28448417. The reversal of 28448388 is 88384482.

It is a happy 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, 131598 + ... + 131813.

It is an arithmetic number, because the mean of its divisors is an integer number (3073140).

Almost surely, 2^28448388 is an apocalyptic number.

It is an amenable number.

28448388 is an abundant number, since it is smaller than the sum of its proper divisors (45306972).

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

28448388 is a wasteful number, since it uses less digits than its factorization.

28448388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263424 (or 263416 counting only the distinct ones).

The product of its digits is 393216, while the sum is 45.

The square root of 28448388 is about 5333.7030288534. The cubic root of 28448388 is about 305.2712377088.

The spelling of 28448388 in words is "twenty-eight million, four hundred forty-eight thousand, three hundred eighty-eight".