727697891 has 8 divisors (see below), whose sum is σ = 766860480. Its totient is φ = 688621608.

The previous prime is 727697857. The next prime is 727697923. The reversal of 727697891 is 198796727.

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 727697891 - 2¹⁰ = 727696867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (727697491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3881 + ... + 38346.

It is an arithmetic number, because the mean of its divisors is an integer number (95857560).

Almost surely, 2^727697891 is an apocalyptic number.

727697891 is a deficient number, since it is larger than the sum of its proper divisors (39162589).

727697891 is a wasteful number, since it uses less digits than its factorization.

727697891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43153.

The product of its digits is 2667168, while the sum is 56.

The square root of 727697891 is about 26975.8760932801. The cubic root of 727697891 is about 899.4638333220.

The spelling of 727697891 in words is "seven hundred twenty-seven million, six hundred ninety-seven thousand, eight hundred ninety-one".