728687 has 2 divisors, whose sum is σ = 728688. Its totient is φ = 728686.

The previous prime is 728681. The next prime is 728699. The reversal of 728687 is 786827.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 728687 - 2¹⁴ = 712303 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 728687.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 728687.

It is not a weakly prime, because it can be changed into another prime (728681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 364343 + 364344.

It is an arithmetic number, because the mean of its divisors is an integer number (364344).

2⁷²⁸⁶⁸⁷ is an apocalyptic number.

728687 is a deficient number, since it is larger than the sum of its proper divisors (1).

728687 is an equidigital number, since it uses as much as digits as its factorization.

728687 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37632, while the sum is 38.

The square root of 728687 is about 853.6316535837. The cubic root of 728687 is about 89.9871174977.

The spelling of 728687 in words is "seven hundred twenty-eight thousand, six hundred eighty-seven".