64786538432 has 112 divisors (see below), whose sum is σ = 162215730432. Its totient is φ = 24937236480.

The previous prime is 64786538423. The next prime is 64786538473. The reversal of 64786538432 is 23483568746.

It is a tau number, because it is divible by the number of its divisors (112).

It is a Harshad number since it is a multiple of its sum of digits (56).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 329828 + ... + 488220.

It is an arithmetic number, because the mean of its divisors is an integer number (1448354736).

Almost surely, 2^64786538432 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 64786538432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81107865216).

64786538432 is an abundant number, since it is smaller than the sum of its proper divisors (97429192000).

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

64786538432 is a wasteful number, since it uses less digits than its factorization.

64786538432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158506 (or 158496 counting only the distinct ones).

The product of its digits is 23224320, while the sum is 56.

The spelling of 64786538432 in words is "sixty-four billion, seven hundred eighty-six million, five hundred thirty-eight thousand, four hundred thirty-two".