2178654720 has 640 divisors, whose sum is σ = 8463958272. Its totient is φ = 471859200.

The previous prime is 2178654707. The next prime is 2178654721. The reversal of 2178654720 is 274568712.

It is a tau number, because it is divible by the number of its divisors (640).

It is not an unprimeable number, because it can be changed into a prime (2178654721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 53137900 + ... + 53137940.

Almost surely, 2^2178654720 is an apocalyptic number.

2178654720 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 2178654720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4231979136).

2178654720 is an abundant number, since it is smaller than the sum of its proper divisors (6285303552).

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

2178654720 is a wasteful number, since it uses less digits than its factorization.

2178654720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132 (or 116 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 42.

The square root of 2178654720 is about 46676.0615305105. The cubic root of 2178654720 is about 1296.3714832052.

The spelling of 2178654720 in words is "two billion, one hundred seventy-eight million, six hundred fifty-four thousand, seven hundred twenty".