673712257 has 4 divisors (see below), whose sum is σ = 673766740. Its totient is φ = 673657776.

The previous prime is 673712231. The next prime is 673712341. The reversal of 673712257 is 752217376.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 143976001 + 529736256 = 11999^2 + 23016^2 .

It is a cyclic number.

It is not a de Polignac number, because 673712257 - 2⁷ = 673712129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (673712357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1219 + ... + 36727.

It is an arithmetic number, because the mean of its divisors is an integer number (168441685).

Almost surely, 2^673712257 is an apocalyptic number.

It is an amenable number.

673712257 is a deficient number, since it is larger than the sum of its proper divisors (54483).

673712257 is a wasteful number, since it uses less digits than its factorization.

673712257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54482.

The product of its digits is 123480, while the sum is 40.

The square root of 673712257 is about 25955.9676567837. The cubic root of 673712257 is about 876.6471317739.

The spelling of 673712257 in words is "six hundred seventy-three million, seven hundred twelve thousand, two hundred fifty-seven".