727681 has 4 divisors (see below), whose sum is σ = 766000. Its totient is φ = 689364.

The previous prime is 727673. The next prime is 727691. The reversal of 727681 is 186727.

It is a happy number.

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 727681 - 2³ = 727673 is a prime.

It is a super-2 number, since 2×727681² = 1059039275522, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (727621) 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, 19131 + ... + 19168.

It is an arithmetic number, because the mean of its divisors is an integer number (191500).

2⁷²⁷⁶⁸¹ is an apocalyptic number.

It is an amenable number.

727681 is a deficient number, since it is larger than the sum of its proper divisors (38319).

727681 is a wasteful number, since it uses less digits than its factorization.

727681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38318.

The product of its digits is 4704, while the sum is 31.

The square root of 727681 is about 853.0422029419. The cubic root of 727681 is about 89.9456873950.

The spelling of 727681 in words is "seven hundred twenty-seven thousand, six hundred eighty-one".