61486918728 has 32 divisors (see below), whose sum is σ = 155209704000. Its totient is φ = 20296651968.

The previous prime is 61486918651. The next prime is 61486918777. The reversal of 61486918728 is 82781968416.

61486918728 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 12434203 + ... + 12439146.

It is an arithmetic number, because the mean of its divisors is an integer number (4850303250).

Almost surely, 2^61486918728 is an apocalyptic number.

It is an amenable number.

61486918728 is an abundant number, since it is smaller than the sum of its proper divisors (93722785272).

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

61486918728 is a wasteful number, since it uses less digits than its factorization.

61486918728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24873461 (or 24873457 counting only the distinct ones).

The product of its digits is 9289728, while the sum is 60.

The spelling of 61486918728 in words is "sixty-one billion, four hundred eighty-six million, nine hundred eighteen thousand, seven hundred twenty-eight".