726697989 has 6 divisors (see below), whose sum is σ = 1049674886. Its totient is φ = 484465320.

The previous prime is 726697987. The next prime is 726698023. The reversal of 726697989 is 989796627.

It can be written as a sum of positive squares in only one way, i.e., 648109764 + 78588225 = 25458^2 + 8865^2 .

It is not a de Polignac number, because 726697989 - 2¹ = 726697987 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (726697987) 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, 40372102 + ... + 40372119.

Almost surely, 2^726697989 is an apocalyptic number.

It is an amenable number.

726697989 is a deficient number, since it is larger than the sum of its proper divisors (322976897).

726697989 is a wasteful number, since it uses less digits than its factorization.

726697989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80744227 (or 80744224 counting only the distinct ones).

The product of its digits is 20575296, while the sum is 63.

The square root of 726697989 is about 26957.3364596727. The cubic root of 726697989 is about 899.0516714691.

The spelling of 726697989 in words is "seven hundred twenty-six million, six hundred ninety-seven thousand, nine hundred eighty-nine".