4449641781 has 32 divisors (see below), whose sum is σ = 6568273152. Its totient is φ = 2662571520.

The previous prime is 4449641743. The next prime is 4449641783. The reversal of 4449641781 is 1871469444.

It is not a de Polignac number, because 4449641781 - 2¹⁵ = 4449609013 is a prime.

It is a super-2 number, since 2×4449641781² = 39598623958441703922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 4449641781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4449641783) 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 31 ways as a sum of consecutive naturals, for example, 191131 + ... + 213143.

It is an arithmetic number, because the mean of its divisors is an integer number (205258536).

Almost surely, 2^4449641781 is an apocalyptic number.

It is an amenable number.

4449641781 is a deficient number, since it is larger than the sum of its proper divisors (2118631371).

4449641781 is a wasteful number, since it uses less digits than its factorization.

4449641781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22173.

The product of its digits is 774144, while the sum is 48.

The square root of 4449641781 is about 66705.6353016745. The cubic root of 4449641781 is about 1644.7820199397.

The spelling of 4449641781 in words is "four billion, four hundred forty-nine million, six hundred forty-one thousand, seven hundred eighty-one".