726206645 has 4 divisors (see below), whose sum is σ = 871447980. Its totient is φ = 580965312.

The previous prime is 726206627. The next prime is 726206687. The reversal of 726206645 is 546602627.

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 566487601 + 159719044 = 23801^2 + 12638^2 .

It is a cyclic number.

It is not a de Polignac number, because 726206645 - 2¹⁰ = 726205621 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 726206599 and 726206608.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72620660 + ... + 72620669.

It is an arithmetic number, because the mean of its divisors is an integer number (217861995).

Almost surely, 2^726206645 is an apocalyptic number.

It is an amenable number.

726206645 is a deficient number, since it is larger than the sum of its proper divisors (145241335).

726206645 is a wasteful number, since it uses less digits than its factorization.

726206645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145241334.

The product of its (nonzero) digits is 120960, while the sum is 38.

The square root of 726206645 is about 26948.2215554199. The cubic root of 726206645 is about 898.8489998194.

The spelling of 726206645 in words is "seven hundred twenty-six million, two hundred six thousand, six hundred forty-five".