726551881 has 6 divisors (see below), whose sum is σ = 798606746. Its totient is φ = 660501600.

The previous prime is 726551827. The next prime is 726551909. The reversal of 726551881 is 188155627.

726551881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 575040400 + 151511481 = 23980^2 + 12309^2 .

It is not a de Polignac number, because 726551881 - 2²¹ = 724454729 is a prime.

It is a super-2 number, since 2×726551881² = 1055755271569276322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (726551801) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3002160 + ... + 3002401.

Almost surely, 2^726551881 is an apocalyptic number.

It is an amenable number.

726551881 is a deficient number, since it is larger than the sum of its proper divisors (72054865).

726551881 is a wasteful number, since it uses less digits than its factorization.

726551881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6004583 (or 6004572 counting only the distinct ones).

The product of its digits is 134400, while the sum is 43.

The square root of 726551881 is about 26954.6263376067. The cubic root of 726551881 is about 898.9914137701.

The spelling of 726551881 in words is "seven hundred twenty-six million, five hundred fifty-one thousand, eight hundred eighty-one".