728742515 has 4 divisors (see below), whose sum is σ = 874491024. Its totient is φ = 582994008.

The previous prime is 728742503. The next prime is 728742523. The reversal of 728742515 is 515247827.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 515247827 = 2099 ⋅245473.

It is a cyclic number.

It is not a de Polignac number, because 728742515 - 2¹⁰ = 728741491 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72874247 + ... + 72874256.

It is an arithmetic number, because the mean of its divisors is an integer number (218622756).

Almost surely, 2^728742515 is an apocalyptic number.

728742515 is a deficient number, since it is larger than the sum of its proper divisors (145748509).

728742515 is a wasteful number, since it uses less digits than its factorization.

728742515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145748508.

The product of its digits is 156800, while the sum is 41.

The square root of 728742515 is about 26995.2313381456. The cubic root of 728742515 is about 899.8940266170.

The spelling of 728742515 in words is "seven hundred twenty-eight million, seven hundred forty-two thousand, five hundred fifteen".