728708613 has 8 divisors (see below), whose sum is σ = 972222528. Its totient is φ = 485500224.

The previous prime is 728708597. The next prime is 728708663. The reversal of 728708613 is 316807827.

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

It is not a de Polignac number, because 728708613 - 2⁴ = 728708597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728708663) 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, 70756 + ... + 80397.

It is an arithmetic number, because the mean of its divisors is an integer number (121527816).

Almost surely, 2^728708613 is an apocalyptic number.

It is an amenable number.

728708613 is a deficient number, since it is larger than the sum of its proper divisors (243513915).

728708613 is a wasteful number, since it uses less digits than its factorization.

728708613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152763.

The product of its (nonzero) digits is 112896, while the sum is 42.

The square root of 728708613 is about 26994.6034051253. The cubic root of 728708613 is about 899.8800716741.

The spelling of 728708613 in words is "seven hundred twenty-eight million, seven hundred eight thousand, six hundred thirteen".