61328642388 has 192 divisors, whose sum is σ = 163703151360. Its totient is φ = 17735897088.

The previous prime is 61328642369. The next prime is 61328642461. The reversal of 61328642388 is 88324682316.

61328642388 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×61328642388² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 61328642388.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 32847831 + ... + 32849697.

It is an arithmetic number, because the mean of its divisors is an integer number (852620580).

Almost surely, 2^61328642388 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 61328642388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81851575680).

61328642388 is an abundant number, since it is smaller than the sum of its proper divisors (102374508972).

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

61328642388 is a wasteful number, since it uses less digits than its factorization.

61328642388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2106 (or 2104 counting only the distinct ones).

The product of its digits is 2654208, while the sum is 51.

The spelling of 61328642388 in words is "sixty-one billion, three hundred twenty-eight million, six hundred forty-two thousand, three hundred eighty-eight".