1649773864 has 16 divisors (see below), whose sum is σ = 3094492500. Its totient is φ = 824575872.

The previous prime is 1649773861. The next prime is 1649773901. The reversal of 1649773864 is 4683779461.

It can be written as a sum of positive squares in 2 ways, for example, as 1449324900 + 200448964 = 38070^2 + 14158^2 .

It is not an unprimeable number, because it can be changed into a prime (1649773861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15517 + ... + 59500.

Almost surely, 2^1649773864 is an apocalyptic number.

It is an amenable number.

1649773864 is a deficient number, since it is larger than the sum of its proper divisors (1444718636).

1649773864 is a wasteful number, since it uses less digits than its factorization.

1649773864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77772 (or 77768 counting only the distinct ones).

The product of its digits is 6096384, while the sum is 55.

The square root of 1649773864 is about 40617.4083860603. The cubic root of 1649773864 is about 1181.6117647353.

The spelling of 1649773864 in words is "one billion, six hundred forty-nine million, seven hundred seventy-three thousand, eight hundred sixty-four".