11772738728 has 16 divisors (see below), whose sum is σ = 22086333780. Its totient is φ = 5883049728.

The previous prime is 11772738727. The next prime is 11772738763. The reversal of 11772738728 is 82783727711.

It can be written as a sum of positive squares in 2 ways, for example, as 10506660004 + 1266078724 = 102502^2 + 35582^2 .

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 11772738728.

It is not an unprimeable number, because it can be changed into a prime (11772738721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 399851 + ... + 428282.

Almost surely, 2^11772738728 is an apocalyptic number.

It is an amenable number.

11772738728 is a deficient number, since it is larger than the sum of its proper divisors (10313595052).

11772738728 is a wasteful number, since it uses less digits than its factorization.

11772738728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 829916 (or 829912 counting only the distinct ones).

The product of its digits is 1843968, while the sum is 53.

The spelling of 11772738728 in words is "eleven billion, seven hundred seventy-two million, seven hundred thirty-eight thousand, seven hundred twenty-eight".