6143644440 has 96 divisors (see below), whose sum is σ = 20112749280. Its totient is φ = 1626333696.

The previous prime is 6143644439. The next prime is 6143644489. The reversal of 6143644440 is 444463416.

6143644440 is a `hidden beast` number, since 6 + 1 + 4 + 3 + 644 + 4 + 4 + 0 = 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 = 6143644395 and 6143644404.

It is a congruent number.

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, 12964 + ... + 111603.

It is an arithmetic number, because the mean of its divisors is an integer number (209507805).

Almost surely, 2^6143644440 is an apocalyptic number.

6143644440 is a gapful number since it is divisible by the number (60) 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 6143644440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10056374640).

6143644440 is an abundant number, since it is smaller than the sum of its proper divisors (13969104840).

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

6143644440 is a wasteful number, since it uses less digits than its factorization.

6143644440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124721 (or 124714 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 36.

The square root of 6143644440 is about 78381.4036618381. The cubic root of 6143644440 is about 1831.5074562756.

The spelling of 6143644440 in words is "six billion, one hundred forty-three million, six hundred forty-four thousand, four hundred forty".