61087921728 has 56 divisors (see below), whose sum is σ = 163674430080. Its totient is φ = 20104880640.

The previous prime is 61087921717. The next prime is 61087921729. The reversal of 61087921728 is 82712978016.

61087921728 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (61087921729) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1998543 + ... + 2028878.

It is an arithmetic number, because the mean of its divisors is an integer number (2922757680).

Almost surely, 2^61087921728 is an apocalyptic number.

It is an amenable number.

61087921728 is an abundant number, since it is smaller than the sum of its proper divisors (102586508352).

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

61087921728 is a wasteful number, since it uses less digits than its factorization.

61087921728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4027515 (or 4027505 counting only the distinct ones).

The product of its (nonzero) digits is 677376, while the sum is 51.

The spelling of 61087921728 in words is "sixty-one billion, eighty-seven million, nine hundred twenty-one thousand, seven hundred twenty-eight".