673540644 has 48 divisors (see below), whose sum is σ = 1834334208. Its totient is φ = 188344608.

The previous prime is 673540583. The next prime is 673540729. The reversal of 673540644 is 446045376.

It is a happy number.

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 15 ways as a sum of consecutive naturals, for example, 81354 + ... + 89249.

It is an arithmetic number, because the mean of its divisors is an integer number (38215296).

Almost surely, 2^673540644 is an apocalyptic number.

It is an amenable number.

673540644 is an abundant number, since it is smaller than the sum of its proper divisors (1160793564).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

673540644 is a wasteful number, since it uses less digits than its factorization.

673540644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170664 (or 170662 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 39.

The square root of 673540644 is about 25952.6615976088. The cubic root of 673540644 is about 876.5726900922.

The spelling of 673540644 in words is "six hundred seventy-three million, five hundred forty thousand, six hundred forty-four".