1679921644 has 6 divisors (see below), whose sum is σ = 2939862884. Its totient is φ = 839960820.

The previous prime is 1679921641. The next prime is 1679921671. The reversal of 1679921644 is 4461299761.

It is not an unprimeable number, because it can be changed into a prime (1679921641) 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 as a sum of consecutive naturals, namely, 209990202 + ... + 209990209.

Almost surely, 2^1679921644 is an apocalyptic number.

It is an amenable number.

1679921644 is a deficient number, since it is larger than the sum of its proper divisors (1259941240).

1679921644 is a wasteful number, since it uses less digits than its factorization.

1679921644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 419980415 (or 419980413 counting only the distinct ones).

The product of its digits is 653184, while the sum is 49.

The square root of 1679921644 is about 40986.8472073664. The cubic root of 1679921644 is about 1188.7659084419.

The spelling of 1679921644 in words is "one billion, six hundred seventy-nine million, nine hundred twenty-one thousand, six hundred forty-four".