616555644 has 24 divisors (see below), whose sum is σ = 1439031888. Its totient is φ = 205461120.

The previous prime is 616555637. The next prime is 616555649. The reversal of 616555644 is 446555616.

It is a junction number, because it is equal to n+sod(n) for n = 616555596 and 616555605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (616555649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77584 + ... + 85160.

It is an arithmetic number, because the mean of its divisors is an integer number (59959662).

Almost surely, 2^616555644 is an apocalyptic number.

It is an amenable number.

616555644 is an abundant number, since it is smaller than the sum of its proper divisors (822476244).

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

616555644 is a wasteful number, since it uses less digits than its factorization.

616555644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14365 (or 14363 counting only the distinct ones).

The product of its digits is 432000, while the sum is 42.

The square root of 616555644 is about 24830.5385362460. The cubic root of 616555644 is about 851.1199281595.

The spelling of 616555644 in words is "six hundred sixteen million, five hundred fifty-five thousand, six hundred forty-four".