728407 has 4 divisors (see below), whose sum is σ = 751936. Its totient is φ = 704880.

The previous prime is 728383. The next prime is 728417. The reversal of 728407 is 704827.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 704827 = 631 ⋅1117.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-728407 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728417) 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, 11718 + ... + 11779.

It is an arithmetic number, because the mean of its divisors is an integer number (187984).

2⁷²⁸⁴⁰⁷ is an apocalyptic number.

728407 is a deficient number, since it is larger than the sum of its proper divisors (23529).

728407 is a wasteful number, since it uses less digits than its factorization.

728407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23528.

The product of its (nonzero) digits is 3136, while the sum is 28.

The square root of 728407 is about 853.4676326610. The cubic root of 728407 is about 89.9755900879.

The spelling of 728407 in words is "seven hundred twenty-eight thousand, four hundred seven".