64729782140 has 24 divisors (see below), whose sum is σ = 135938891760. Its totient is φ = 25890703488.

The previous prime is 64729782121. The next prime is 64729782181. The reversal of 64729782140 is 4128792746.

It is a happy number.

64729782140 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 453704 + ... + 579056.

It is an arithmetic number, because the mean of its divisors is an integer number (5664120490).

Almost surely, 2^64729782140 is an apocalyptic number.

It is an amenable number.

64729782140 is an abundant number, since it is smaller than the sum of its proper divisors (71209109620).

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

64729782140 is a wasteful number, since it uses less digits than its factorization.

64729782140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151181 (or 151179 counting only the distinct ones).

The product of its (nonzero) digits is 1354752, while the sum is 50.

The spelling of 64729782140 in words is "sixty-four billion, seven hundred twenty-nine million, seven hundred eighty-two thousand, one hundred forty".