64645447272 has 128 divisors (see below), whose sum is σ = 186070521600. Its totient is φ = 18333646848.

The previous prime is 64645447267. The next prime is 64645447301. The reversal of 64645447272 is 27274454646.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16501858 + ... + 16505774.

It is an arithmetic number, because the mean of its divisors is an integer number (1453675950).

Almost surely, 2^64645447272 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 64645447272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93035260800).

64645447272 is an abundant number, since it is smaller than the sum of its proper divisors (121425074328).

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

64645447272 is a wasteful number, since it uses less digits than its factorization.

64645447272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4635 (or 4631 counting only the distinct ones).

The product of its digits is 9031680, while the sum is 51.

The spelling of 64645447272 in words is "sixty-four billion, six hundred forty-five million, four hundred forty-seven thousand, two hundred seventy-two".