12628278 has 32 divisors (see below), whose sum is σ = 30223200. Its totient is φ = 3885408.

The previous prime is 12628277. The next prime is 12628303. The reversal of 12628278 is 87282621.

It is a happy number.

12628278 is a `hidden beast` number, since 1 + 2 + 628 + 27 + 8 = 666.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12628277) 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, 8293 + ... + 9696.

It is an arithmetic number, because the mean of its divisors is an integer number (944475).

Almost surely, 2^12628278 is an apocalyptic number.

12628278 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

12628278 is an abundant number, since it is smaller than the sum of its proper divisors (17594922).

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

12628278 is a wasteful number, since it uses less digits than its factorization.

12628278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18013 (or 18007 counting only the distinct ones).

The product of its digits is 21504, while the sum is 36.

The square root of 12628278 is about 3553.6288495002. The cubic root of 12628278 is about 232.8706263554.

The spelling of 12628278 in words is "twelve million, six hundred twenty-eight thousand, two hundred seventy-eight".