616145408 has 30 divisors (see below), whose sum is σ = 1232210661. Its totient is φ = 307791872.

The previous prime is 616145407. The next prime is 616145443. The reversal of 616145408 is 804541616.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 2 ways, for example, as 586027264 + 30118144 = 24208^2 + 5488^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=17552.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (616145407) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 561116 + ... + 562212.

Almost surely, 2^616145408 is an apocalyptic number.

It is an amenable number.

616145408 is a deficient number, since it is larger than the sum of its proper divisors (616065253).

616145408 is an frugal number, since it uses more digits than its factorization.

616145408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2212 (or 1099 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 616145408 is about 24822.2764467726. The cubic root of 616145408 is about 850.9311171377.

The spelling of 616145408 in words is "six hundred sixteen million, one hundred forty-five thousand, four hundred eight".