616709385 has 12 divisors (see below), whose sum is σ = 1068963012. Its totient is φ = 328911648.

The previous prime is 616709371. The next prime is 616709407. The reversal of 616709385 is 583907616.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 103550976 + 513158409 = 10176^2 + 22653^2 .

It is not a de Polignac number, because 616709385 - 2⁸ = 616709129 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 13704653 = 616709385 / (6 + 1 + 6 + 7 + 0 + 9 + 3 + 8 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 616709385.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6852282 + ... + 6852371.

It is an arithmetic number, because the mean of its divisors is an integer number (89080251).

Almost surely, 2^616709385 is an apocalyptic number.

It is an amenable number.

616709385 is a deficient number, since it is larger than the sum of its proper divisors (452253627).

616709385 is a wasteful number, since it uses less digits than its factorization.

616709385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13704664 (or 13704661 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 45.

The square root of 616709385 is about 24833.6341480662. The cubic root of 616709385 is about 851.1906658431.

The spelling of 616709385 in words is "six hundred sixteen million, seven hundred nine thousand, three hundred eighty-five".