726725765 has 4 divisors (see below), whose sum is σ = 872070924. Its totient is φ = 581380608.

The previous prime is 726725749. The next prime is 726725789. The reversal of 726725765 is 567527627.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 301994884 + 424730881 = 17378^2 + 20609^2 .

It is a cyclic number.

It is not a de Polignac number, because 726725765 - 2⁴ = 726725749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72672572 + ... + 72672581.

It is an arithmetic number, because the mean of its divisors is an integer number (218017731).

Almost surely, 2^726725765 is an apocalyptic number.

It is an amenable number.

726725765 is a deficient number, since it is larger than the sum of its proper divisors (145345159).

726725765 is a wasteful number, since it uses less digits than its factorization.

726725765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145345158.

The product of its digits is 1234800, while the sum is 47.

The square root of 726725765 is about 26957.8516391793. The cubic root of 726725765 is about 899.0631259025.

The spelling of 726725765 in words is "seven hundred twenty-six million, seven hundred twenty-five thousand, seven hundred sixty-five".