673861266 has 96 divisors (see below), whose sum is σ = 1692735408. Its totient is φ = 191877120.

The previous prime is 673861261. The next prime is 673861267. The reversal of 673861266 is 662168376.

673861266 is a `hidden beast` number, since 6 + 7 + 386 + 1 + 266 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 39879225 + 633982041 = 6315^2 + 25179^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (673861261) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 241270 + ... + 244046.

Almost surely, 2^673861266 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 673861266, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (846367704).

673861266 is an abundant number, since it is smaller than the sum of its proper divisors (1018874142).

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

673861266 is a wasteful number, since it uses less digits than its factorization.

673861266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2876 (or 2873 counting only the distinct ones).

The product of its digits is 435456, while the sum is 45.

The square root of 673861266 is about 25958.8379169793. The cubic root of 673861266 is about 876.7117581193.

The spelling of 673861266 in words is "six hundred seventy-three million, eight hundred sixty-one thousand, two hundred sixty-six".