3128445649 has 8 divisors (see below), whose sum is σ = 3612226688. Its totient is φ = 2653879680.

The previous prime is 3128445647. The next prime is 3128445653. The reversal of 3128445649 is 9465448213.

3128445649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3128445649 - 2¹ = 3128445647 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3128445599 and 3128445608.

It is not an unprimeable number, because it can be changed into a prime (3128445647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2303037 + ... + 2304394.

It is an arithmetic number, because the mean of its divisors is an integer number (451528336).

Almost surely, 2^3128445649 is an apocalyptic number.

It is an amenable number.

3128445649 is a deficient number, since it is larger than the sum of its proper divisors (483781039).

3128445649 is an equidigital number, since it uses as much as digits as its factorization.

3128445649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4607535.

The product of its digits is 829440, while the sum is 46.

The square root of 3128445649 is about 55932.5097684701. The cubic root of 3128445649 is about 1462.5460124711.

The spelling of 3128445649 in words is "three billion, one hundred twenty-eight million, four hundred forty-five thousand, six hundred forty-nine".