723281861 has 4 divisors (see below), whose sum is σ = 740922924. Its totient is φ = 705640800.

The previous prime is 723281777. The next prime is 723281903. The reversal of 723281861 is 168182327.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 335585761 + 387696100 = 18319^2 + 19690^2 .

It is a cyclic number.

It is not a de Polignac number, because 723281861 - 2²⁶ = 656172997 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 (723251861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8820470 + ... + 8820551.

It is an arithmetic number, because the mean of its divisors is an integer number (185230731).

Almost surely, 2^723281861 is an apocalyptic number.

It is an amenable number.

723281861 is a deficient number, since it is larger than the sum of its proper divisors (17641063).

723281861 is a wasteful number, since it uses less digits than its factorization.

723281861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17641062.

The product of its digits is 32256, while the sum is 38.

The square root of 723281861 is about 26893.9000704621. The cubic root of 723281861 is about 897.6406768881.

The spelling of 723281861 in words is "seven hundred twenty-three million, two hundred eighty-one thousand, eight hundred sixty-one".