2660437440 has 448 divisors, whose sum is σ = 10138867200. Its totient is φ = 654262272.

The previous prime is 2660437357. The next prime is 2660437463. The reversal of 2660437440 is 447340662.

2660437440 is a `hidden beast` number, since 2 + 6 + 604 + 3 + 7 + 4 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 2660437395 and 2660437404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 8665767 + ... + 8666073.

It is an arithmetic number, because the mean of its divisors is an integer number (22631400).

Almost surely, 2^2660437440 is an apocalyptic number.

2660437440 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 2660437440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5069433600).

2660437440 is an abundant number, since it is smaller than the sum of its proper divisors (7478429760).

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

2660437440 is a wasteful number, since it uses less digits than its factorization.

2660437440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409 (or 393 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 36.

The square root of 2660437440 is about 51579.4284574771. The cubic root of 2660437440 is about 1385.6419307022.

The spelling of 2660437440 in words is "two billion, six hundred sixty million, four hundred thirty-seven thousand, four hundred forty".