61713020728 has 16 divisors (see below), whose sum is σ = 115740384480. Its totient is φ = 30848918208.

The previous prime is 61713020711. The next prime is 61713020767. The reversal of 61713020728 is 82702031716.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 914400 + ... + 979567.

It is an arithmetic number, because the mean of its divisors is an integer number (7233774030).

Almost surely, 2^61713020728 is an apocalyptic number.

It is an amenable number.

61713020728 is a deficient number, since it is larger than the sum of its proper divisors (54027363752).

61713020728 is a wasteful number, since it uses less digits than its factorization.

61713020728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1898046 (or 1898042 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 37.

The spelling of 61713020728 in words is "sixty-one billion, seven hundred thirteen million, twenty thousand, seven hundred twenty-eight".