616628645 has 4 divisors (see below), whose sum is σ = 739954380. Its totient is φ = 493302912.

The previous prime is 616628627. The next prime is 616628669. The reversal of 616628645 is 546826616.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 108847489 + 507781156 = 10433^2 + 22534^2 .

It is a cyclic number.

It is not a de Polignac number, because 616628645 - 2¹⁴ = 616612261 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 616628596 and 616628605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61662860 + ... + 61662869.

It is an arithmetic number, because the mean of its divisors is an integer number (184988595).

Almost surely, 2^616628645 is an apocalyptic number.

It is an amenable number.

616628645 is a deficient number, since it is larger than the sum of its proper divisors (123325735).

616628645 is a wasteful number, since it uses less digits than its factorization.

616628645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123325734.

The product of its digits is 414720, while the sum is 44.

The square root of 616628645 is about 24832.0084769638. The cubic root of 616628645 is about 851.1535180738.

It can be divided in two parts, 61662 and 8645, that added together give a palindrome (70307).

The spelling of 616628645 in words is "six hundred sixteen million, six hundred twenty-eight thousand, six hundred forty-five".