728427 has 8 divisors (see below), whose sum is σ = 1110016. Its totient is φ = 416232.

The previous prime is 728423. The next prime is 728437. The reversal of 728427 is 724827.

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

It is not a de Polignac number, because 728427 - 2² = 728423 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 728394 and 728403.

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 728427.

It is not an unprimeable number, because it can be changed into a prime (728423) 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, 17323 + ... + 17364.

It is an arithmetic number, because the mean of its divisors is an integer number (138752).

2⁷²⁸⁴²⁷ is an apocalyptic number.

728427 is a deficient number, since it is larger than the sum of its proper divisors (381589).

728427 is a wasteful number, since it uses less digits than its factorization.

728427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34697.

The product of its digits is 6272, while the sum is 30.

The square root of 728427 is about 853.4793494866. The cubic root of 728427 is about 89.9764135723.

Subtracting from 728427 its reverse (724827), we obtain a square (3600 = 60²).

The spelling of 728427 in words is "seven hundred twenty-eight thousand, four hundred twenty-seven".