12033557028 has 18 divisors (see below), whose sum is σ = 30418158134. Its totient is φ = 4011185664.

The previous prime is 12033557017. The next prime is 12033557051. The reversal of 12033557028 is 82075533021.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 11992878144 + 40678884 = 109512^2 + 6378^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×12033557028² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 334265473 = 12033557028 / (1 + 2 + 0 + 3 + 3 + 5 + 5 + 7 + 0 + 2 + 8).

It is a junction number, because it is equal to n+sod(n) for n = 12033556983 and 12033557001.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 167132701 + ... + 167132772.

Almost surely, 2^12033557028 is an apocalyptic number.

12033557028 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

12033557028 is an abundant number, since it is smaller than the sum of its proper divisors (18384601106).

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

12033557028 is a wasteful number, since it uses less digits than its factorization.

12033557028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334265483 (or 334265478 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 36.

The spelling of 12033557028 in words is "twelve billion, thirty-three million, five hundred fifty-seven thousand, twenty-eight".