12788428 has 6 divisors (see below), whose sum is σ = 22379756. Its totient is φ = 6394212.

The previous prime is 12788411. The next prime is 12788429. The reversal of 12788428 is 82488721.

It is a super-2 number, since 2×12788428² = 327087781422368, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12788429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1598550 + ... + 1598557.

Almost surely, 2^12788428 is an apocalyptic number.

It is an amenable number.

12788428 is a deficient number, since it is larger than the sum of its proper divisors (9591328).

12788428 is a wasteful number, since it uses less digits than its factorization.

12788428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3197111 (or 3197109 counting only the distinct ones).

The product of its digits is 57344, while the sum is 40.

The square root of 12788428 is about 3576.0911621490. The cubic root of 12788428 is about 233.8509046086.

The spelling of 12788428 in words is "twelve million, seven hundred eighty-eight thousand, four hundred twenty-eight".