64446521272 has 96 divisors (see below), whose sum is σ = 146795483520. Its totient is φ = 26397792960.

The previous prime is 64446521267. The next prime is 64446521327. The reversal of 64446521272 is 27212564446.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16326003 + ... + 16329949.

It is an arithmetic number, because the mean of its divisors is an integer number (1529119620).

Almost surely, 2^64446521272 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64446521272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73397741760).

64446521272 is an abundant number, since it is smaller than the sum of its proper divisors (82348962248).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64446521272 is a wasteful number, since it uses less digits than its factorization.

64446521272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5801 (or 5790 counting only the distinct ones).

The product of its digits is 645120, while the sum is 43.

The spelling of 64446521272 in words is "sixty-four billion, four hundred forty-six million, five hundred twenty-one thousand, two hundred seventy-two".