723865744809 has 9 divisors (see below), whose sum is σ = 1045587540439. Its totient is φ = 482575461600.

The previous prime is 723865744783. The next prime is 723865744841. The reversal of 723865744809 is 908447568327.

The square root of 723865744809 is 850803.

It is a perfect power (a square), and thus also a powerful number.

723865744809 is a `hidden beast` number, since 7 + 2 + 3 + 86 + 5 + 74 + 480 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 634656002409 + 89209742400 = 796653^2 + 298680^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 723865744809 - 2¹³ = 723865736617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (723865744309) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2410609 + ... + 2694209.

Almost surely, 2^723865744809 is an apocalyptic number.

723865744809 is the 850803-rd square number.

723865744809 is the 425402-nd centered octagonal number.

It is an amenable number.

723865744809 is a deficient number, since it is larger than the sum of its proper divisors (321721795630).

723865744809 is an frugal number, since it uses more digits than its factorization.

723865744809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 567208 (or 283604 counting only the distinct ones).

The product of its (nonzero) digits is 81285120, while the sum is 63.

The spelling of 723865744809 in words is "seven hundred twenty-three billion, eight hundred sixty-five million, seven hundred forty-four thousand, eight hundred nine".