2555281440 has 144 divisors (see below), whose sum is σ = 8737642368. Its totient is φ = 680022528.

The previous prime is 2555281433. The next prime is 2555281453. The reversal of 2555281440 is 441825552.

2555281440 is a `hidden beast` number, since 25 + 552 + 81 + 4 + 4 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

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 = 2555281395 and 2555281404.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 843769 + ... + 846791.

It is an arithmetic number, because the mean of its divisors is an integer number (60678072).

Almost surely, 2^2555281440 is an apocalyptic number.

2555281440 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 2555281440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4368821184).

2555281440 is an abundant number, since it is smaller than the sum of its proper divisors (6182360928).

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

2555281440 is a wasteful number, since it uses less digits than its factorization.

2555281440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3631 (or 3620 counting only the distinct ones).

The product of its (nonzero) digits is 64000, while the sum is 36.

The square root of 2555281440 is about 50549.7916909655. The cubic root of 2555281440 is about 1367.1397587461.

The spelling of 2555281440 in words is "two billion, five hundred fifty-five million, two hundred eighty-one thousand, four hundred forty".