611728643 has 2 divisors, whose sum is σ = 611728644. Its totient is φ = 611728642.

The previous prime is 611728627. The next prime is 611728669. The reversal of 611728643 is 346827116.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 611728643 - 2⁴ = 611728627 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 611728597 and 611728606.

It is not a weakly prime, because it can be changed into another prime (611728043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305864321 + 305864322.

It is an arithmetic number, because the mean of its divisors is an integer number (305864322).

Almost surely, 2^611728643 is an apocalyptic number.

611728643 is a deficient number, since it is larger than the sum of its proper divisors (1).

611728643 is an equidigital number, since it uses as much as digits as its factorization.

611728643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48384, while the sum is 38.

The square root of 611728643 is about 24733.1486673250. The cubic root of 611728643 is about 848.8929731535.

The spelling of 611728643 in words is "six hundred eleven million, seven hundred twenty-eight thousand, six hundred forty-three".