12783428 has 24 divisors (see below), whose sum is σ = 26913600. Its totient is φ = 5190048.

The previous prime is 12783401. The next prime is 12783451. The reversal of 12783428 is 82438721.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11483 + ... + 12546.

It is an arithmetic number, because the mean of its divisors is an integer number (1121400).

Almost surely, 2^12783428 is an apocalyptic number.

It is an amenable number.

12783428 is an abundant number, since it is smaller than the sum of its proper divisors (14130172).

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

12783428 is a wasteful number, since it uses less digits than its factorization.

12783428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24059 (or 24057 counting only the distinct ones).

The product of its digits is 21504, while the sum is 35.

The square root of 12783428 is about 3575.3920064798. The cubic root of 12783428 is about 233.8204237463.

The spelling of 12783428 in words is "twelve million, seven hundred eighty-three thousand, four hundred twenty-eight".