728437 has 2 divisors, whose sum is σ = 728438. Its totient is φ = 728436.

The previous prime is 728423. The next prime is 728471. The reversal of 728437 is 734827.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 367236 + 361201 = 606^2 + 601^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-728437 is a prime.

It is a Chen prime.

728437 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 728399 and 728408.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (728417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 364218 + 364219.

It is an arithmetic number, because the mean of its divisors is an integer number (364219).

2⁷²⁸⁴³⁷ is an apocalyptic number.

It is an amenable number.

728437 is a deficient number, since it is larger than the sum of its proper divisors (1).

728437 is an equidigital number, since it uses as much as digits as its factorization.

728437 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9408, while the sum is 31.

The square root of 728437 is about 853.4852078390. The cubic root of 728437 is about 89.9768253088.

The spelling of 728437 in words is "seven hundred twenty-eight thousand, four hundred thirty-seven".