616728393 has 6 divisors (see below), whose sum is σ = 890829914. Its totient is φ = 411152256.

The previous prime is 616728377. The next prime is 616728443. The reversal of 616728393 is 393827616.

616728393 is a `hidden beast` number, since 616 + 7 + 28 + 3 + 9 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 336098889 + 280629504 = 18333^2 + 16752^2 .

It is not a de Polignac number, because 616728393 - 2⁴ = 616728377 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (616728293) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 34262680 + ... + 34262697.

Almost surely, 2^616728393 is an apocalyptic number.

It is an amenable number.

616728393 is a deficient number, since it is larger than the sum of its proper divisors (274101521).

616728393 is a wasteful number, since it uses less digits than its factorization.

616728393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68525383 (or 68525380 counting only the distinct ones).

The product of its digits is 326592, while the sum is 45.

The square root of 616728393 is about 24834.0168518909. The cubic root of 616728393 is about 851.1994107865.

The spelling of 616728393 in words is "six hundred sixteen million, seven hundred twenty-eight thousand, three hundred ninety-three".