1428807728 has 40 divisors (see below), whose sum is σ = 2868826800. Its totient is φ = 688552704.

The previous prime is 1428807719. The next prime is 1428807739. The reversal of 1428807728 is 8277088241.

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, 295958 + ... + 300746.

It is an arithmetic number, because the mean of its divisors is an integer number (71720670).

Almost surely, 2^1428807728 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 1428807728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1434413400).

1428807728 is an abundant number, since it is smaller than the sum of its proper divisors (1440019072).

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

1428807728 is a wasteful number, since it uses less digits than its factorization.

1428807728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5469 (or 5463 counting only the distinct ones).

The product of its (nonzero) digits is 401408, while the sum is 47.

The square root of 1428807728 is about 37799.5731192827. The cubic root of 1428807728 is about 1126.3099744239.

The spelling of 1428807728 in words is "one billion, four hundred twenty-eight million, eight hundred seven thousand, seven hundred twenty-eight".