726261731 has 16 divisors (see below), whose sum is σ = 818125056. Its totient is φ = 639683616.

The previous prime is 726261691. The next prime is 726261749. The reversal of 726261731 is 137162627.

726261731 = 426² + 427² + ... + 1311².

It is not a de Polignac number, because 726261731 - 2²² = 722067427 is a prime.

It is a super-2 number, since 2×726261731² = 1054912203830232722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 726261691 and 726261700.

It is not an unprimeable number, because it can be changed into a prime (726221731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 129716 + ... + 135198.

It is an arithmetic number, because the mean of its divisors is an integer number (51132816).

Almost surely, 2^726261731 is an apocalyptic number.

726261731 is a deficient number, since it is larger than the sum of its proper divisors (91863325).

726261731 is a wasteful number, since it uses less digits than its factorization.

726261731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5962.

The product of its digits is 21168, while the sum is 35.

The square root of 726261731 is about 26949.2436071961. The cubic root of 726261731 is about 898.8717264746.

The spelling of 726261731 in words is "seven hundred twenty-six million, two hundred sixty-one thousand, seven hundred thirty-one".