61520946728 has 16 divisors (see below), whose sum is σ = 115354732500. Its totient is φ = 30759684736.

The previous prime is 61520946709. The next prime is 61520946731. The reversal of 61520946728 is 82764902516.

61520946728 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 46035135364 + 15485811364 = 214558^2 + 124442^2 .

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, 356588 + ... + 500196.

Almost surely, 2^61520946728 is an apocalyptic number.

It is an amenable number.

61520946728 is a deficient number, since it is larger than the sum of its proper divisors (53833785772).

61520946728 is a wasteful number, since it uses less digits than its factorization.

61520946728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197164 (or 197160 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 50.

The spelling of 61520946728 in words is "sixty-one billion, five hundred twenty million, nine hundred forty-six thousand, seven hundred twenty-eight".