1643410944 has 560 divisors, whose sum is σ = 6118456608. Its totient is φ = 429981696.

The previous prime is 1643410939. The next prime is 1643410949. The reversal of 1643410944 is 4490143461.

It is a happy number.

1643410944 is a `hidden beast` number, since 1 + 643 + 4 + 1 + 0 + 9 + 4 + 4 = 666.

It is an interprime number because it is at equal distance from previous prime (1643410939) and next prime (1643410949).

It is a super-2 number, since 2×1643410944² = 5401599061717942272, which contains 22 as substring.

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 = 1643410899 and 1643410908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1643410949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 44416494 + ... + 44416530.

Almost surely, 2^1643410944 is an apocalyptic number.

1643410944 is a gapful number since it is divisible by the number (14) 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 1643410944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3059228304).

1643410944 is an abundant number, since it is smaller than the sum of its proper divisors (4475045664).

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

1643410944 is an frugal number, since it uses more digits than its factorization.

1643410944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97 (or 66 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 1643410944 is about 40539.0052171979. The cubic root of 1643410944 is about 1180.0907102535.

The spelling of 1643410944 in words is "one billion, six hundred forty-three million, four hundred ten thousand, nine hundred forty-four".