726787739761 has 8 divisors (see below), whose sum is σ = 733565192360. Its totient is φ = 720012281472.

The previous prime is 726787739747. The next prime is 726787739801. The reversal of 726787739761 is 167937787627.

It can be written as a sum of positive squares in 4 ways, for example, as 417162266161 + 309625473600 = 645881^2 + 556440^2 .

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 726787739761 - 2¹³ = 726787731569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (726787739261) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 238741 + ... + 1229053.

It is an arithmetic number, because the mean of its divisors is an integer number (91695649045).

Almost surely, 2^726787739761 is an apocalyptic number.

It is an amenable number.

726787739761 is a deficient number, since it is larger than the sum of its proper divisors (6777452599).

726787739761 is a wasteful number, since it uses less digits than its factorization.

726787739761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 997155.

The product of its digits is 261382464, while the sum is 70.

The spelling of 726787739761 in words is "seven hundred twenty-six billion, seven hundred eighty-seven million, seven hundred thirty-nine thousand, seven hundred sixty-one".