64441652728 has 16 divisors (see below), whose sum is σ = 120842577000. Its totient is φ = 32216965536.

The previous prime is 64441652711. The next prime is 64441652797. The reversal of 64441652728 is 82725614446.

It is a super-2 number, since 2×64441652728² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 411043 + ... + 545746.

Almost surely, 2^64441652728 is an apocalyptic number.

It is an amenable number.

64441652728 is a deficient number, since it is larger than the sum of its proper divisors (56400924272).

64441652728 is a wasteful number, since it uses less digits than its factorization.

64441652728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 965214 (or 965210 counting only the distinct ones).

The product of its digits is 2580480, while the sum is 49.

The spelling of 64441652728 in words is "sixty-four billion, four hundred forty-one million, six hundred fifty-two thousand, seven hundred twenty-eight".