723637425640 has 16 divisors (see below), whose sum is σ = 1628184207780. Its totient is φ = 289454970240.

The previous prime is 723637425619. The next prime is 723637425671. The reversal of 723637425640 is 46524736327.

723637425640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 720845148676 + 2792276964 = 849026^2 + 52842^2 .

It is a super-2 number, since 2×723637425640² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9045467781 + ... + 9045467860.

Almost surely, 2^723637425640 is an apocalyptic number.

It is an amenable number.

723637425640 is an abundant number, since it is smaller than the sum of its proper divisors (904546782140).

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

723637425640 is a wasteful number, since it uses less digits than its factorization.

723637425640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18090935652 (or 18090935648 counting only the distinct ones).

The product of its (nonzero) digits is 5080320, while the sum is 49.

The spelling of 723637425640 in words is "seven hundred twenty-three billion, six hundred thirty-seven million, four hundred twenty-five thousand, six hundred forty".