2644525440 has 384 divisors, whose sum is σ = 9795427200. Its totient is φ = 655097856.

The previous prime is 2644525421. The next prime is 2644525451. The reversal of 2644525440 is 445254462.

2644525440 is a `hidden beast` number, since 2 + 64 + 4 + 52 + 544 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (384).

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 = 2644525395 and 2644525404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 11064841 + ... + 11065079.

It is an arithmetic number, because the mean of its divisors is an integer number (25508925).

Almost surely, 2^2644525440 is an apocalyptic number.

2644525440 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 2644525440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4897713600).

2644525440 is an abundant number, since it is smaller than the sum of its proper divisors (7150901760).

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

2644525440 is a wasteful number, since it uses less digits than its factorization.

2644525440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394 (or 379 counting only the distinct ones).

The product of its (nonzero) digits is 153600, while the sum is 36.

The square root of 2644525440 is about 51424.9495867521. The cubic root of 2644525440 is about 1382.8739099837.

The spelling of 2644525440 in words is "two billion, six hundred forty-four million, five hundred twenty-five thousand, four hundred forty".