12028781601 has 24 divisors (see below), whose sum is σ = 18070468416. Its totient is φ = 7704275040.

The previous prime is 12028781599. The next prime is 12028781621. The reversal of 12028781601 is 10618782021.

12028781601 is a `hidden beast` number, since 1 + 20 + 28 + 7 + 8 + 1 + 601 = 666.

It is not a de Polignac number, because 12028781601 - 2¹ = 12028781599 is a prime.

It is a super-2 number, since 2×12028781601² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12028781621) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 231165 + ... + 278378.

It is an arithmetic number, because the mean of its divisors is an integer number (752936184).

Almost surely, 2^12028781601 is an apocalyptic number.

It is an amenable number.

12028781601 is a deficient number, since it is larger than the sum of its proper divisors (6041686815).

12028781601 is a wasteful number, since it uses less digits than its factorization.

12028781601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 509653 (or 509650 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 36.

The spelling of 12028781601 in words is "twelve billion, twenty-eight million, seven hundred eighty-one thousand, six hundred one".