2178409464 has 432 divisors, whose sum is σ = 7853118000. Its totient is φ = 565820640.

The previous prime is 2178409423. The next prime is 2178409483. The reversal of 2178409464 is 4649048712.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 198037219 + ... + 198037229.

It is a vampire number, since it can be written as 29106 ⋅ 74844 (with its own digits).

Almost surely, 2^2178409464 is an apocalyptic number.

2178409464 is a gapful number since it is divisible by the number (24) 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 2178409464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3926559000).

2178409464 is an abundant number, since it is smaller than the sum of its proper divisors (5674708536).

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

2178409464 is an frugal number, since it uses more digits than its factorization.

2178409464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73 (or 23 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 45.

The square root of 2178409464 is about 46673.4342426181. The cubic root of 2178409464 is about 1296.3228362408.

The spelling of 2178409464 in words is "two billion, one hundred seventy-eight million, four hundred nine thousand, four hundred sixty-four".