842649664 has 28 divisors (see below), whose sum is σ = 1674151084. Its totient is φ = 420816384.

The previous prime is 842649641. The next prime is 842649673. The reversal of 842649664 is 466946248.

It can be written as a sum of positive squares in 2 ways, for example, as 665227264 + 177422400 = 25792^2 + 13320^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48622 + ... + 63634.

Almost surely, 2^842649664 is an apocalyptic number.

It is an amenable number.

842649664 is a deficient number, since it is larger than the sum of its proper divisors (831501420).

842649664 is a wasteful number, since it uses less digits than its factorization.

842649664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15902 (or 15892 counting only the distinct ones).

The product of its digits is 1990656, while the sum is 49.

The square root of 842649664 is about 29028.4285485798. The cubic root of 842649664 is about 944.5298423644.

The spelling of 842649664 in words is "eight hundred forty-two million, six hundred forty-nine thousand, six hundred sixty-four".