728427613 has 4 divisors (see below), whose sum is σ = 729163648. Its totient is φ = 727691580.

The previous prime is 728427563. The next prime is 728427619. The reversal of 728427613 is 316724827.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 316724827 = 283 ⋅1119169.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-728427613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728427619) 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, 366531 + ... + 368512.

It is an arithmetic number, because the mean of its divisors is an integer number (182290912).

Almost surely, 2^728427613 is an apocalyptic number.

It is an amenable number.

728427613 is a deficient number, since it is larger than the sum of its proper divisors (736035).

728427613 is an equidigital number, since it uses as much as digits as its factorization.

728427613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 736034.

The product of its digits is 112896, while the sum is 40.

The square root of 728427613 is about 26989.3981592773. The cubic root of 728427613 is about 899.7643881186.

The spelling of 728427613 in words is "seven hundred twenty-eight million, four hundred twenty-seven thousand, six hundred thirteen".