616381540 has 12 divisors (see below), whose sum is σ = 1294401276. Its totient is φ = 246552608.

The previous prime is 616381537. The next prime is 616381543. The reversal of 616381540 is 45183616.

It is a happy number.

616381540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (616381537) and next prime (616381543).

It can be written as a sum of positive squares in 2 ways, for example, as 486467136 + 129914404 = 22056^2 + 11398^2 .

It is a junction number, because it is equal to n+sod(n) for n = 616381496 and 616381505.

It is not an unprimeable number, because it can be changed into a prime (616381543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15409519 + ... + 15409558.

It is an arithmetic number, because the mean of its divisors is an integer number (107866773).

Almost surely, 2^616381540 is an apocalyptic number.

It is an amenable number.

616381540 is an abundant number, since it is smaller than the sum of its proper divisors (678019736).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

616381540 is a wasteful number, since it uses less digits than its factorization.

616381540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30819086 (or 30819084 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 616381540 is about 24827.0324444949. The cubic root of 616381540 is about 851.0398070676.

The spelling of 616381540 in words is "six hundred sixteen million, three hundred eighty-one thousand, five hundred forty".