728667 has 6 divisors (see below), whose sum is σ = 1052532. Its totient is φ = 485772.

The previous prime is 728659. The next prime is 728681. The reversal of 728667 is 766827.

It is not a de Polignac number, because 728667 - 2³ = 728659 is a prime.

728667 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (728627) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 40473 + ... + 40490.

It is an arithmetic number, because the mean of its divisors is an integer number (175422).

2⁷²⁸⁶⁶⁷ is an apocalyptic number.

728667 is a deficient number, since it is larger than the sum of its proper divisors (323865).

728667 is a wasteful number, since it uses less digits than its factorization.

728667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80969 (or 80966 counting only the distinct ones).

The product of its digits is 28224, while the sum is 36.

The square root of 728667 is about 853.6199388487. The cubic root of 728667 is about 89.9862942092.

The spelling of 728667 in words is "seven hundred twenty-eight thousand, six hundred sixty-seven".