728812 has 12 divisors (see below), whose sum is σ = 1457680. Its totient is φ = 312336.

The previous prime is 728809. The next prime is 728813. The reversal of 728812 is 218827.

728812 is an admirable number.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (28), and also a Moran number because the ratio is a prime number: 26029 = 728812 / (7 + 2 + 8 + 8 + 1 + 2).

It is not an unprimeable number, because it can be changed into a prime (728813) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12987 + ... + 13042.

2⁷²⁸⁸¹² is an apocalyptic number.

It is an amenable number.

728812 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

728812 is a wasteful number, since it uses less digits than its factorization.

728812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26040 (or 26038 counting only the distinct ones).

The product of its digits is 1792, while the sum is 28.

The square root of 728812 is about 853.7048670354. The cubic root of 728812 is about 89.9922627093.

It can be divided in two parts, 728 and 812, that added together give a triangular number (1540 = T₅₅).

The spelling of 728812 in words is "seven hundred twenty-eight thousand, eight hundred twelve".