61720072364 has 24 divisors (see below), whose sum is σ = 115412885280. Its totient is φ = 28778270976.

The previous prime is 61720072357. The next prime is 61720072369. The reversal of 61720072364 is 46327002716.

It is not an unprimeable number, because it can be changed into a prime (61720072369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4156112 + ... + 4170935.

It is an arithmetic number, because the mean of its divisors is an integer number (4808870220).

Almost surely, 2^61720072364 is an apocalyptic number.

It is an amenable number.

61720072364 is a deficient number, since it is larger than the sum of its proper divisors (53692812916).

61720072364 is a wasteful number, since it uses less digits than its factorization.

61720072364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8327177 (or 8327175 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 38.

The spelling of 61720072364 in words is "sixty-one billion, seven hundred twenty million, seventy-two thousand, three hundred sixty-four".