64275939729 has 9 divisors (see below), whose sum is σ = 92844122683. Its totient is φ = 42850119432.

The previous prime is 64275939697. The next prime is 64275939731. The reversal of 64275939729 is 92793957246.

The square root of 64275939729 is 253527.

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., 44174371329 + 20101568400 = 210177^2 + 141780^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 64275939729 - 2⁵ = 64275939697 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (64275939769) by changing a digit.

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 8 ways as a sum of consecutive naturals, for example, 718327 + ... + 802835.

Almost surely, 2^64275939729 is an apocalyptic number.

64275939729 is the 253527-th square number.

64275939729 is the 126764-th centered octagonal number.

It is an amenable number.

64275939729 is a deficient number, since it is larger than the sum of its proper divisors (28568182954).

64275939729 is an frugal number, since it uses more digits than its factorization.

64275939729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169024 (or 84512 counting only the distinct ones).

The product of its digits is 51438240, while the sum is 63.

It can be divided in two parts, 64275 and 939729, that added together give a square (1004004 = 1002²).

The spelling of 64275939729 in words is "sixty-four billion, two hundred seventy-five million, nine hundred thirty-nine thousand, seven hundred twenty-nine".