6440055739 has 16 divisors (see below), whose sum is σ = 7087272192. Its totient is φ = 5815924128.

The previous prime is 6440055731. The next prime is 6440055749. The reversal of 6440055739 is 9375500446.

It is a cyclic number.

It is not a de Polignac number, because 6440055739 - 2³ = 6440055731 is a prime.

It is a super-2 number, since 2×6440055739² = 82948635842853672242, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6440055695 and 6440055704.

It is not an unprimeable number, because it can be changed into a prime (6440055731) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82164 + ... + 140110.

It is an arithmetic number, because the mean of its divisors is an integer number (442954512).

Almost surely, 2^6440055739 is an apocalyptic number.

6440055739 is a deficient number, since it is larger than the sum of its proper divisors (647216453).

6440055739 is a wasteful number, since it uses less digits than its factorization.

6440055739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58146.

The product of its (nonzero) digits is 453600, while the sum is 43.

The square root of 6440055739 is about 80249.9578753784. The cubic root of 6440055739 is about 1860.5008612811.

The spelling of 6440055739 in words is "six billion, four hundred forty million, fifty-five thousand, seven hundred thirty-nine".