726718761 has 12 divisors (see below), whose sum is σ = 1050574980. Its totient is φ = 484077600.

The previous prime is 726718717. The next prime is 726718763. The reversal of 726718761 is 167817627.

It can be written as a sum of positive squares in 2 ways, for example, as 708571161 + 18147600 = 26619^2 + 4260^2 .

It is not a de Polignac number, because 726718761 - 2¹⁰ = 726717737 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (726718763) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21790 + ... + 43911.

It is an arithmetic number, because the mean of its divisors is an integer number (87547915).

Almost surely, 2^726718761 is an apocalyptic number.

It is an amenable number.

726718761 is a deficient number, since it is larger than the sum of its proper divisors (323856219).

726718761 is a wasteful number, since it uses less digits than its factorization.

726718761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66936 (or 66933 counting only the distinct ones).

The product of its digits is 197568, while the sum is 45.

The square root of 726718761 is about 26957.7217323720. The cubic root of 726718761 is about 899.0602375785.

The spelling of 726718761 in words is "seven hundred twenty-six million, seven hundred eighteen thousand, seven hundred sixty-one".