It is a congruent number.
It is an unprimeable number.
Almost surely, 2220878840 is an apocalyptic number.
220878840 is a gapful number since it is divisible by the number (20) 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 220878840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (413683200).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
220878840 is a wasteful number, since it uses less digits than its factorization.
220878840 is an evil number, because the sum of its binary digits is even.
The square root of 220878840 is about 14861.9931368575. The cubic root of 220878840 is about 604.4838527487.
The spelling of 220878840 in words is "two hundred twenty million, eight hundred seventy-eight thousand, eight hundred forty".