12278428 has 6 divisors (see below), whose sum is σ = 21487256. Its totient is φ = 6139212.

The previous prime is 12278423. The next prime is 12278429. The reversal of 12278428 is 82487221.

It is a super-3 number, since 3×12278428³ (a number of 22 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12278393 and 12278402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12278423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1534800 + ... + 1534807.

Almost surely, 2^12278428 is an apocalyptic number.

It is an amenable number.

12278428 is a deficient number, since it is larger than the sum of its proper divisors (9208828).

12278428 is a wasteful number, since it uses less digits than its factorization.

12278428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3069611 (or 3069609 counting only the distinct ones).

The product of its digits is 14336, while the sum is 34.

The square root of 12278428 is about 3504.0587894612. The cubic root of 12278428 is about 230.6999972255.

The spelling of 12278428 in words is "twelve million, two hundred seventy-eight thousand, four hundred twenty-eight".