816728 has 16 divisors (see below), whose sum is σ = 1670760. Its totient is φ = 371200.

The previous prime is 816709. The next prime is 816743. The reversal of 816728 is 827618.

816728 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a plaindrome in base 12.

It is a junction number, because it is equal to n+sod(n) for n = 816694 and 816703.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4553 + ... + 4728.

2⁸¹⁶⁷²⁸ is an apocalyptic number.

816728 is a gapful number since it is divisible by the number (88) formed by its first and last digit.

It is an amenable number.

816728 is an abundant number, since it is smaller than the sum of its proper divisors (854032).

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

816728 is a wasteful number, since it uses less digits than its factorization.

816728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9298 (or 9294 counting only the distinct ones).

The product of its digits is 5376, while the sum is 32.

The square root of 816728 is about 903.7300481892. The cubic root of 816728 is about 93.4743559746.

The spelling of 816728 in words is "eight hundred sixteen thousand, seven hundred twenty-eight".