673647066 has 96 divisors (see below), whose sum is σ = 1598959440. Its totient is φ = 204152832.

The previous prime is 673647059. The next prime is 673647101. The reversal of 673647066 is 660746376.

It can be written as a sum of positive squares in 8 ways, for example, as 411887025 + 261760041 = 20295^2 + 16179^2 .

It is a Curzon number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 1183630 + ... + 1184198.

Almost surely, 2^673647066 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 673647066, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (799479720).

673647066 is an abundant number, since it is smaller than the sum of its proper divisors (925312374).

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

673647066 is a wasteful number, since it uses less digits than its factorization.

673647066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 720 (or 717 counting only the distinct ones).

The product of its (nonzero) digits is 762048, while the sum is 45.

The square root of 673647066 is about 25954.7118265644. The cubic root of 673647066 is about 876.6188549411.

The spelling of 673647066 in words is "six hundred seventy-three million, six hundred forty-seven thousand, sixty-six".