64108720440 has 384 divisors, whose sum is σ = 223105259520. Its totient is φ = 15935616000.

The previous prime is 64108720397. The next prime is 64108720453. The reversal of 64108720440 is 4402780146.

64108720440 is a `hidden beast` number, since 641 + 0 + 8 + 7 + 2 + 0 + 4 + 4 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 64108720395 and 64108720404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 44181715 + ... + 44183165.

It is an arithmetic number, because the mean of its divisors is an integer number (581003280).

Almost surely, 2^64108720440 is an apocalyptic number.

64108720440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64108720440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111552629760).

64108720440 is an abundant number, since it is smaller than the sum of its proper divisors (158996539080).

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

64108720440 is a wasteful number, since it uses less digits than its factorization.

64108720440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1643 (or 1636 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 36.

The spelling of 64108720440 in words is "sixty-four billion, one hundred eight million, seven hundred twenty thousand, four hundred forty".