268723681 has 4 divisors (see below), whose sum is σ = 269113264. Its totient is φ = 268334100.

The previous prime is 268723673. The next prime is 268723687. The reversal of 268723681 is 186327862.

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 268723681 - 2³ = 268723673 is a prime.

It is a super-2 number, since 2×268723681² = 144424833460379522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (268723687) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 193755 + ... + 195136.

It is an arithmetic number, because the mean of its divisors is an integer number (67278316).

Almost surely, 2^268723681 is an apocalyptic number.

It is an amenable number.

268723681 is a deficient number, since it is larger than the sum of its proper divisors (389583).

268723681 is an equidigital number, since it uses as much as digits as its factorization.

268723681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389582.

The product of its digits is 193536, while the sum is 43.

The square root of 268723681 is about 16392.7935691266. The cubic root of 268723681 is about 645.3103736299.

The spelling of 268723681 in words is "two hundred sixty-eight million, seven hundred twenty-three thousand, six hundred eighty-one".