11961630728 has 16 divisors (see below), whose sum is σ = 23608482000. Its totient is φ = 5666035536.

The previous prime is 11961630719. The next prime is 11961630773. The reversal of 11961630728 is 82703616911.

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, 39347318 + ... + 39347621.

It is an arithmetic number, because the mean of its divisors is an integer number (1475530125).

Almost surely, 2^11961630728 is an apocalyptic number.

It is an amenable number.

11961630728 is a deficient number, since it is larger than the sum of its proper divisors (11646851272).

11961630728 is a wasteful number, since it uses less digits than its factorization.

11961630728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78694964 (or 78694960 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 44.

The spelling of 11961630728 in words is "eleven billion, nine hundred sixty-one million, six hundred thirty thousand, seven hundred twenty-eight".