64720532140 has 96 divisors (see below), whose sum is σ = 155503079424. Its totient is φ = 22396872960.

The previous prime is 64720532087. The next prime is 64720532141. The reversal of 64720532140 is 4123502746.

64720532140 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 64720532096 and 64720532105.

It is not an unprimeable number, because it can be changed into a prime (64720532141) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 964357 + ... + 1029283.

It is an arithmetic number, because the mean of its divisors is an integer number (1619823744).

Almost surely, 2^64720532140 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 64720532140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77751539712).

64720532140 is an abundant number, since it is smaller than the sum of its proper divisors (90782547284).

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

64720532140 is a wasteful number, since it uses less digits than its factorization.

64720532140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65167 (or 65165 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 34.

The spelling of 64720532140 in words is "sixty-four billion, seven hundred twenty million, five hundred thirty-two thousand, one hundred forty".