64448120840 has 128 divisors (see below), whose sum is σ = 160540185600. Its totient is φ = 23188239360.

The previous prime is 64448120819. The next prime is 64448120851. The reversal of 64448120840 is 4802184446.

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 31 ways as a sum of consecutive naturals, for example, 1222874 + ... + 1274486.

It is an arithmetic number, because the mean of its divisors is an integer number (1254220200).

Almost surely, 2^64448120840 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 64448120840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80270092800).

64448120840 is an abundant number, since it is smaller than the sum of its proper divisors (96092064760).

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

64448120840 is a wasteful number, since it uses less digits than its factorization.

64448120840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51727 (or 51723 counting only the distinct ones).

The product of its (nonzero) digits is 196608, while the sum is 41.

The spelling of 64448120840 in words is "sixty-four billion, four hundred forty-eight million, one hundred twenty thousand, eight hundred forty".