616728397 has 8 divisors (see below), whose sum is σ = 656324856. Its totient is φ = 577500672.

The previous prime is 616728377. The next prime is 616728443. The reversal of 616728397 is 793827616.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 401842116 + 214886281 = 20046^2 + 14659^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 616728397 - 2¹¹ = 616726349 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 616728397.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (616728337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88728 + ... + 95425.

It is an arithmetic number, because the mean of its divisors is an integer number (82040607).

Almost surely, 2^616728397 is an apocalyptic number.

It is an amenable number.

616728397 is a deficient number, since it is larger than the sum of its proper divisors (39596459).

616728397 is a wasteful number, since it uses less digits than its factorization.

616728397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184367.

The product of its digits is 762048, while the sum is 49.

The square root of 616728397 is about 24834.0169324256. The cubic root of 616728397 is about 851.1994126267.

The spelling of 616728397 in words is "six hundred sixteen million, seven hundred twenty-eight thousand, three hundred ninety-seven".