723245640 has 192 divisors, whose sum is σ = 2474452800. Its totient is φ = 168569856.

The previous prime is 723245639. The next prime is 723245647. The reversal of 723245640 is 46542327.

723245640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (723245647) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 384382 + ... + 386258.

It is an arithmetic number, because the mean of its divisors is an integer number (12887775).

Almost surely, 2^723245640 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 723245640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1237226400).

723245640 is an abundant number, since it is smaller than the sum of its proper divisors (1751207160).

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

723245640 is a wasteful number, since it uses less digits than its factorization.

723245640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1936 (or 1919 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 33.

The square root of 723245640 is about 26893.2266565394. The cubic root of 723245640 is about 897.6256924182.

Adding to 723245640 its reverse (46542327), we get a palindrome (769787967).

The spelling of 723245640 in words is "seven hundred twenty-three million, two hundred forty-five thousand, six hundred forty".