64441712731 has 32 divisors (see below), whose sum is σ = 75362918400. Its totient is φ = 54511564800.

The previous prime is 64441712689. The next prime is 64441712743. The reversal of 64441712731 is 13721714446.

It is not a de Polignac number, because 64441712731 - 2⁹ = 64441712219 is a prime.

It is a super-2 number, since 2×64441712731² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64441722731) 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, 3652870 + ... + 3670468.

It is an arithmetic number, because the mean of its divisors is an integer number (2355091200).

Almost surely, 2^64441712731 is an apocalyptic number.

64441712731 is a deficient number, since it is larger than the sum of its proper divisors (10921205669).

64441712731 is a wasteful number, since it uses less digits than its factorization.

64441712731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18027.

The product of its digits is 112896, while the sum is 40.

The spelling of 64441712731 in words is "sixty-four billion, four hundred forty-one million, seven hundred twelve thousand, seven hundred thirty-one".