616327821 has 12 divisors (see below), whose sum is σ = 890490172. Its totient is φ = 410774976.

The previous prime is 616327799. The next prime is 616327837. The reversal of 616327821 is 128723616.

616327821 is a `hidden beast` number, since 616 + 32 + 7 + 8 + 2 + 1 = 666.

616327821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 340402500 + 275925321 = 18450^2 + 16611^2 .

It is not a de Polignac number, because 616327821 - 2¹⁸ = 616065677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (616327421) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40185 + ... + 53361.

Almost surely, 2^616327821 is an apocalyptic number.

It is an amenable number.

616327821 is a deficient number, since it is larger than the sum of its proper divisors (274162351).

616327821 is a wasteful number, since it uses less digits than its factorization.

616327821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18380 (or 18377 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 616327821 is about 24825.9505558196. The cubic root of 616327821 is about 851.0150830222.

The spelling of 616327821 in words is "six hundred sixteen million, three hundred twenty-seven thousand, eight hundred twenty-one".