673605261 has 16 divisors (see below), whose sum is σ = 1140496000. Its totient is φ = 384917184.

The previous prime is 673605241. The next prime is 673605281. The reversal of 673605261 is 162506376.

673605261 is a `hidden beast` number, since 6 + 73 + 60 + 526 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (673605241) and next prime (673605281).

It is not a de Polignac number, because 673605261 - 2⁶ = 673605197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (673605211) 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 in 15 ways as a sum of consecutive naturals, for example, 1781836 + ... + 1782213.

It is an arithmetic number, because the mean of its divisors is an integer number (71281000).

Almost surely, 2^673605261 is an apocalyptic number.

It is an amenable number.

673605261 is a deficient number, since it is larger than the sum of its proper divisors (466890739).

673605261 is a wasteful number, since it uses less digits than its factorization.

673605261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3564065 (or 3564059 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 36.

The square root of 673605261 is about 25953.9064689692. The cubic root of 673605261 is about 876.6007209106.

The spelling of 673605261 in words is "six hundred seventy-three million, six hundred five thousand, two hundred sixty-one".