61988680736 has 48 divisors (see below), whose sum is σ = 134048779200. Its totient is φ = 28086398208.

The previous prime is 61988680723. The next prime is 61988680777. The reversal of 61988680736 is 63708688916.

It is a happy 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, 2202431 + ... + 2230398.

It is an arithmetic number, because the mean of its divisors is an integer number (2792682900).

Almost surely, 2^61988680736 is an apocalyptic number.

It is an amenable number.

61988680736 is an abundant number, since it is smaller than the sum of its proper divisors (72060098464).

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

61988680736 is a wasteful number, since it uses less digits than its factorization.

61988680736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4432881 (or 4432873 counting only the distinct ones).

The product of its (nonzero) digits is 20901888, while the sum is 62.

The spelling of 61988680736 in words is "sixty-one billion, nine hundred eighty-eight million, six hundred eighty thousand, seven hundred thirty-six".