726992861 has 12 divisors (see below), whose sum is σ = 846302940. Its totient is φ = 622681920.

The previous prime is 726992857. The next prime is 726992863. The reversal of 726992861 is 168299627.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 692005636 + 34987225 = 26306^2 + 5915^2 .

It is not a de Polignac number, because 726992861 - 2² = 726992857 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (726992863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 74231 + ... + 83451.

It is an arithmetic number, because the mean of its divisors is an integer number (70525245).

Almost surely, 2^726992861 is an apocalyptic number.

It is an amenable number.

726992861 is a deficient number, since it is larger than the sum of its proper divisors (119310079).

726992861 is a wasteful number, since it uses less digits than its factorization.

726992861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10844 (or 10837 counting only the distinct ones).

The product of its digits is 653184, while the sum is 50.

The square root of 726992861 is about 26962.8051396734. The cubic root of 726992861 is about 899.1732576573.

The spelling of 726992861 in words is "seven hundred twenty-six million, nine hundred ninety-two thousand, eight hundred sixty-one".