44139068649 has 27 divisors (see below), whose sum is σ = 69050848503. Its totient is φ = 27157461552.

The previous prime is 44139068627. The next prime is 44139068681. The reversal of 44139068649 is 94686093144.

It is a happy number.

The square root of 44139068649 is 210093.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 6529448025 + 37609620624 = 80805^2 + 193932^2 .

It is not a de Polignac number, because 44139068649 - 2⁷ = 44139068521 is a prime.

It is a super-2 number, since 2×44139068649² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 44139068595 and 44139068604.

It is not an unprimeable number, because it can be changed into a prime (44139061649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 8190934 + ... + 8196320.

Almost surely, 2^44139068649 is an apocalyptic number.

44139068649 is the 210093-rd square number.

44139068649 is the 105047-th centered octagonal number.

It is an amenable number.

44139068649 is a deficient number, since it is larger than the sum of its proper divisors (24911779854).

44139068649 is an frugal number, since it uses more digits than its factorization.

44139068649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10806 (or 5403 counting only the distinct ones).

The product of its (nonzero) digits is 4478976, while the sum is 54.

The spelling of 44139068649 in words is "forty-four billion, one hundred thirty-nine million, sixty-eight thousand, six hundred forty-nine".