61443838720 has 108 divisors (see below), whose sum is σ = 161773688160. Its totient is φ = 22343157760.

The previous prime is 61443838717. The next prime is 61443838721. The reversal of 61443838720 is 2783834416.

It is not an unprimeable number, because it can be changed into a prime (61443838721) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 43480 + ... + 353239.

It is an arithmetic number, because the mean of its divisors is an integer number (1497904520).

Almost surely, 2^61443838720 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 61443838720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80886844080).

61443838720 is an abundant number, since it is smaller than the sum of its proper divisors (100329849440).

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

61443838720 is a wasteful number, since it uses less digits than its factorization.

61443838720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396762 (or 396737 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 46.

The spelling of 61443838720 in words is "sixty-one billion, four hundred forty-three million, eight hundred thirty-eight thousand, seven hundred twenty".