728649 has 8 divisors (see below), whose sum is σ = 1079520. Its totient is φ = 485748.

The previous prime is 728647. The next prime is 728659. The reversal of 728649 is 946827.

728649 is a `hidden beast` number, since 7 + 2 + 8 + 649 = 666.

728649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 728649 - 2¹ = 728647 is a prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 728649.

It is not an unprimeable number, because it can be changed into a prime (728647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13467 + ... + 13520.

It is an arithmetic number, because the mean of its divisors is an integer number (134940).

2⁷²⁸⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

728649 is a deficient number, since it is larger than the sum of its proper divisors (350871).

728649 is a wasteful number, since it uses less digits than its factorization.

728649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26996 (or 26990 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 728649 is about 853.6093954497. The cubic root of 728649 is about 89.9855532367.

The spelling of 728649 in words is "seven hundred twenty-eight thousand, six hundred forty-nine".