256609723 has 8 divisors (see below), whose sum is σ = 266977280. Its totient is φ = 246372840.

The previous prime is 256609721. The next prime is 256609733. The reversal of 256609723 is 327906652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 256609723 - 2¹ = 256609721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256609721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28653 + ... + 36526.

It is an arithmetic number, because the mean of its divisors is an integer number (33372160).

Almost surely, 2^256609723 is an apocalyptic number.

256609723 is a deficient number, since it is larger than the sum of its proper divisors (10367557).

256609723 is a wasteful number, since it uses less digits than its factorization.

256609723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65337.

The product of its (nonzero) digits is 136080, while the sum is 40.

The square root of 256609723 is about 16019.0425119606. The cubic root of 256609723 is about 635.4641226316.

The spelling of 256609723 in words is "two hundred fifty-six million, six hundred nine thousand, seven hundred twenty-three".