728387 has 8 divisors (see below), whose sum is σ = 829440. Its totient is φ = 633160.

The previous prime is 728383. The next prime is 728417. The reversal of 728387 is 783827.

It is a happy number.

728387 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 728387 - 2² = 728383 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 728387.

It is not an unprimeable number, because it can be changed into a prime (728381) 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, 1187 + ... + 1692.

It is an arithmetic number, because the mean of its divisors is an integer number (103680).

2⁷²⁸³⁸⁷ is an apocalyptic number.

728387 is a deficient number, since it is larger than the sum of its proper divisors (101053).

728387 is a wasteful number, since it uses less digits than its factorization.

728387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2913.

The product of its digits is 18816, while the sum is 35.

The square root of 728387 is about 853.4559156746. The cubic root of 728387 is about 89.9747665885.

The spelling of 728387 in words is "seven hundred twenty-eight thousand, three hundred eighty-seven".