1723207680 has 156 divisors (see below), whose sum is σ = 5973696300. Its totient is φ = 459472896.

The previous prime is 1723207649. The next prime is 1723207687. The reversal of 1723207680 is 867023271.

It can be written as a sum of positive squares in 2 ways, for example, as 1090584576 + 632623104 = 33024^2 + 25152^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1723207687) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 179646 + ... + 188994.

It is an arithmetic number, because the mean of its divisors is an integer number (38292925).

Almost surely, 2^1723207680 is an apocalyptic number.

1723207680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1723207680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2986848150).

1723207680 is an abundant number, since it is smaller than the sum of its proper divisors (4250488620).

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

1723207680 is an equidigital number, since it uses as much as digits as its factorization.

1723207680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9384 (or 9359 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 36.

The square root of 1723207680 is about 41511.5367096907. The cubic root of 1723207680 is about 1198.8896395666.

The spelling of 1723207680 in words is "one billion, seven hundred twenty-three million, two hundred seven thousand, six hundred eighty".