731728513 has 8 divisors (see below), whose sum is σ = 770789600. Its totient is φ = 692722368.

The previous prime is 731728511. The next prime is 731728523. The reversal of 731728513 is 315827137.

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

It is not a de Polignac number, because 731728513 - 2¹ = 731728511 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (731728511) 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, 15193 + ... + 41161.

It is an arithmetic number, because the mean of its divisors is an integer number (96348700).

Almost surely, 2^731728513 is an apocalyptic number.

It is an amenable number.

731728513 is a deficient number, since it is larger than the sum of its proper divisors (39061087).

731728513 is a wasteful number, since it uses less digits than its factorization.

731728513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27471.

The product of its digits is 35280, while the sum is 37.

The square root of 731728513 is about 27050.4808275195. The cubic root of 731728513 is about 901.1214468943.

The spelling of 731728513 in words is "seven hundred thirty-one million, seven hundred twenty-eight thousand, five hundred thirteen".