It is an unprimeable number.
Almost surely, 2705438720 is an apocalyptic number.
705438720 is a gapful number since it is divisible by the number (70) 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 705438720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1450455072).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
705438720 is an frugal number, since it uses more digits than its factorization.
705438720 is an odious number, because the sum of its binary digits is odd.
The square root of 705438720 is about 26560.0963853673. The cubic root of 705438720 is about 890.1976247586.
The spelling of 705438720 in words is "seven hundred five million, four hundred thirty-eight thousand, seven hundred twenty".