4461991644 has 72 divisors (see below), whose sum is σ = 11631675664. Its totient is φ = 1329926400.

The previous prime is 4461991637. The next prime is 4461991661.

4461991644 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×4461991644² = 39818738862251645472, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 4461991593 and 4461991602.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 63384 + ... + 113760.

Almost surely, 2^4461991644 is an apocalyptic number.

4461991644 is a gapful number since it is divisible by the number (44) 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 4461991644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5815837832).

4461991644 is an abundant number, since it is smaller than the sum of its proper divisors (7169684020).

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

4461991644 is a wasteful number, since it uses less digits than its factorization.

4461991644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50467 (or 50454 counting only the distinct ones).

The product of its digits is 746496, while the sum is 48.

The square root of 4461991644 is about 66798.1410220374. The cubic root of 4461991644 is about 1646.3022972981.

The spelling of 4461991644 in words is "four billion, four hundred sixty-one million, nine hundred ninety-one thousand, six hundred forty-four".