64653238272 has 336 divisors, whose sum is σ = 202292565696. Its totient is φ = 17989632000.

The previous prime is 64653238267. The next prime is 64653238297. The reversal of 64653238272 is 27283235646.

It is a tau number, because it is divible by the number of its divisors (336).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 640131022 + ... + 640131122.

Almost surely, 2^64653238272 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 64653238272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101146282848).

64653238272 is an abundant number, since it is smaller than the sum of its proper divisors (137639327424).

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

64653238272 is an equidigital number, since it uses as much as digits as its factorization.

64653238272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259 (or 174 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 48.

The spelling of 64653238272 in words is "sixty-four billion, six hundred fifty-three million, two hundred thirty-eight thousand, two hundred seventy-two".