1428728 has 32 divisors (see below), whose sum is σ = 3164160. Its totient is φ = 591840.

The previous prime is 1428709. The next prime is 1428751. The reversal of 1428728 is 8278241.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 1428694 and 1428703.

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, 1325 + ... + 2147.

It is an arithmetic number, because the mean of its divisors is an integer number (98880).

2^1428728 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 1428728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1582080).

1428728 is an abundant number, since it is smaller than the sum of its proper divisors (1735432).

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

1428728 is a wasteful number, since it uses less digits than its factorization.

1428728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 867 (or 863 counting only the distinct ones).

The product of its digits is 7168, while the sum is 32.

The square root of 1428728 is about 1195.2941060676. The cubic root of 1428728 is about 112.6289024530.

The spelling of 1428728 in words is "one million, four hundred twenty-eight thousand, seven hundred twenty-eight".