2178938880 has 480 divisors, whose sum is σ = 8134045920. Its totient is φ = 557383680.

The previous prime is 2178938869. The next prime is 2178938903. The reversal of 2178938880 is 888398712.

It is a tau number, because it is divible by the number of its divisors (480).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 30689245 + ... + 30689315.

It is an arithmetic number, because the mean of its divisors is an integer number (16945929).

Almost surely, 2^2178938880 is an apocalyptic number.

2178938880 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 2178938880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4067022960).

2178938880 is an abundant number, since it is smaller than the sum of its proper divisors (5955107040).

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

2178938880 is an equidigital number, since it uses as much as digits as its factorization.

2178938880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147 (or 118 counting only the distinct ones).

The product of its (nonzero) digits is 1548288, while the sum is 54.

The square root of 2178938880 is about 46679.1053898851. The cubic root of 2178938880 is about 1296.4278422820.

The spelling of 2178938880 in words is "two billion, one hundred seventy-eight million, nine hundred thirty-eight thousand, eight hundred eighty".