61189297728 has 56 divisors (see below), whose sum is σ = 174350281728. Its totient is φ = 18827475456.

The previous prime is 61189297721. The next prime is 61189297733. The reversal of 61189297728 is 82779298116.

It is not an unprimeable number, because it can be changed into a prime (61189297721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12254976 + ... + 12259967.

It is an arithmetic number, because the mean of its divisors is an integer number (3113397888).

Almost surely, 2^61189297728 is an apocalyptic number.

It is an amenable number.

61189297728 is an abundant number, since it is smaller than the sum of its proper divisors (113160984000).

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

61189297728 is a wasteful number, since it uses less digits than its factorization.

61189297728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24514971 (or 24514961 counting only the distinct ones).

The product of its digits is 6096384, while the sum is 60.

The spelling of 61189297728 in words is "sixty-one billion, one hundred eighty-nine million, two hundred ninety-seven thousand, seven hundred twenty-eight".