616720616 has 8 divisors (see below), whose sum is σ = 1156351170. Its totient is φ = 308360304.

The previous prime is 616720613. The next prime is 616720631. The reversal of 616720616 is 616027616.

It can be written as a sum of positive squares in only one way, i.e., 612760516 + 3960100 = 24754^2 + 1990^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (616720613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38545031 + ... + 38545046.

Almost surely, 2^616720616 is an apocalyptic number.

It is an amenable number.

616720616 is a deficient number, since it is larger than the sum of its proper divisors (539630554).

616720616 is a wasteful number, since it uses less digits than its factorization.

616720616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77090083 (or 77090079 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 616720616 is about 24833.8602718144. The cubic root of 616720616 is about 851.1958328713.

The spelling of 616720616 in words is "six hundred sixteen million, seven hundred twenty thousand, six hundred sixteen".