12004000428 has 48 divisors (see below), whose sum is σ = 32875829504. Its totient is φ = 3337018560.

The previous prime is 12004000423. The next prime is 12004000429. The reversal of 12004000428 is 82400040021.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (12004000423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1928038 + ... + 1934253.

Almost surely, 2^12004000428 is an apocalyptic number.

It is an amenable number.

12004000428 is an abundant number, since it is smaller than the sum of its proper divisors (20871829076).

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

12004000428 is a wasteful number, since it uses less digits than its factorization.

12004000428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3862342 (or 3862340 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 12004000428 its reverse (82400040021), we get a palindrome (94404040449).

The spelling of 12004000428 in words is "twelve billion, four million, four hundred twenty-eight", and thus it is an aban number.