726740505 has 40 divisors (see below), whose sum is σ = 1327369032. Its totient is φ = 380270592.

The previous prime is 726740503. The next prime is 726740507. The reversal of 726740505 is 505047627.

It is an interprime number because it is at equal distance from previous prime (726740503) and next prime (726740507).

It can be written as a sum of positive squares in 4 ways, for example, as 390971529 + 335768976 = 19773^2 + 18324^2 .

It is not a de Polignac number, because 726740505 - 2¹ = 726740503 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 726740505.

It is not an unprimeable number, because it can be changed into a prime (726740503) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 4537 + ... + 38393.

Almost surely, 2^726740505 is an apocalyptic number.

It is an amenable number.

726740505 is a deficient number, since it is larger than the sum of its proper divisors (600628527).

726740505 is a wasteful number, since it uses less digits than its factorization.

726740505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33927 (or 33918 counting only the distinct ones).

The product of its (nonzero) digits is 58800, while the sum is 36.

The square root of 726740505 is about 26958.1250275311. The cubic root of 726740505 is about 899.0692043535.

The spelling of 726740505 in words is "seven hundred twenty-six million, seven hundred forty thousand, five hundred five".