64634301728 has 24 divisors (see below), whose sum is σ = 130208058288. Its totient is φ = 31565588544.

The previous prime is 64634301727. The next prime is 64634301761. The reversal of 64634301728 is 82710343646.

It is a super-2 number, since 2×64634301728² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64634301727) 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 3 ways as a sum of consecutive naturals, for example, 23484926 + ... + 23487677.

It is an arithmetic number, because the mean of its divisors is an integer number (5425335762).

Almost surely, 2^64634301728 is an apocalyptic number.

It is an amenable number.

64634301728 is an abundant number, since it is smaller than the sum of its proper divisors (65573756560).

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

64634301728 is a wasteful number, since it uses less digits than its factorization.

64634301728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46972656 (or 46972648 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 44.

The spelling of 64634301728 in words is "sixty-four billion, six hundred thirty-four million, three hundred one thousand, seven hundred twenty-eight".