64440128418764 has 24 divisors (see below), whose sum is σ = 130208919284640. Its totient is φ = 27332484512256.

The previous prime is 64440128418761. The next prime is 64440128418767. The reversal of 64440128418764 is 46781482104446.

It is an interprime number because it is at equal distance from previous prime (64440128418761) and next prime (64440128418767).

It is not an unprimeable number, because it can be changed into a prime (64440128418761) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11863054799 + ... + 11863060230.

It is an arithmetic number, because the mean of its divisors is an integer number (5425371636860).

Almost surely, 2^{64440128418764} is an apocalyptic number.

It is an amenable number.

64440128418764 is an abundant number, since it is smaller than the sum of its proper divisors (65768790865876).

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

64440128418764 is a wasteful number, since it uses less digits than its factorization.

64440128418764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23726115137 (or 23726115135 counting only the distinct ones).

The product of its (nonzero) digits is 33030144, while the sum is 59.

The spelling of 64440128418764 in words is "sixty-four trillion, four hundred forty billion, one hundred twenty-eight million, four hundred eighteen thousand, seven hundred sixty-four".