723445823640 has 256 divisors, whose sum is σ = 2259450547200. Its totient is φ = 185179889664.

The previous prime is 723445823629. The next prime is 723445823647. The reversal of 723445823640 is 46328544327.

It is a self number, because there is not a number n which added to its sum of digits gives 723445823640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (723445823647) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 76688364 + ... + 76697796.

It is an arithmetic number, because the mean of its divisors is an integer number (8825978700).

Almost surely, 2^723445823640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 723445823640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1129725273600).

723445823640 is an abundant number, since it is smaller than the sum of its proper divisors (1536004723560).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

723445823640 is a wasteful number, since it uses less digits than its factorization.

723445823640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9746 (or 9742 counting only the distinct ones).

The product of its (nonzero) digits is 3870720, while the sum is 48.

The spelling of 723445823640 in words is "seven hundred twenty-three billion, four hundred forty-five million, eight hundred twenty-three thousand, six hundred forty".