723649680 has 160 divisors (see below), whose sum is σ = 2684411520. Its totient is φ = 178122240.

The previous prime is 723649669. The next prime is 723649681. The reversal of 723649680 is 86946327.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (723649681) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15195 + ... + 40965.

It is an arithmetic number, because the mean of its divisors is an integer number (16777572).

Almost surely, 2^723649680 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 723649680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1342205760).

723649680 is an abundant number, since it is smaller than the sum of its proper divisors (1960761840).

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

723649680 is a wasteful number, since it uses less digits than its factorization.

723649680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25806 (or 25794 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 45.

The square root of 723649680 is about 26900.7375363576. The cubic root of 723649680 is about 897.7928136789.

The spelling of 723649680 in words is "seven hundred twenty-three million, six hundred forty-nine thousand, six hundred eighty".