256673413 has 4 divisors (see below), whose sum is σ = 270182560. Its totient is φ = 243164268.

The previous prime is 256673411. The next prime is 256673441. The reversal of 256673413 is 314376652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 256673413 - 2¹ = 256673411 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256673411) 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 3 ways as a sum of consecutive naturals, for example, 6754545 + ... + 6754582.

It is an arithmetic number, because the mean of its divisors is an integer number (67545640).

Almost surely, 2^256673413 is an apocalyptic number.

It is an amenable number.

256673413 is a deficient number, since it is larger than the sum of its proper divisors (13509147).

256673413 is a wasteful number, since it uses less digits than its factorization.

256673413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13509146.

The product of its digits is 90720, while the sum is 37.

The square root of 256673413 is about 16021.0303351564. The cubic root of 256673413 is about 635.5166919075.

The spelling of 256673413 in words is "two hundred fifty-six million, six hundred seventy-three thousand, four hundred thirteen".