12779128 has 8 divisors (see below), whose sum is σ = 23960880. Its totient is φ = 6389560.

The previous prime is 12779101. The next prime is 12779131. The reversal of 12779128 is 82197721.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×12779128² = 326612224880768, which contains 22 as substring.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 798688 + ... + 798703.

It is an arithmetic number, because the mean of its divisors is an integer number (2995110).

Almost surely, 2^12779128 is an apocalyptic number.

It is an amenable number.

12779128 is a deficient number, since it is larger than the sum of its proper divisors (11181752).

12779128 is a wasteful number, since it uses less digits than its factorization.

12779128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1597397 (or 1597393 counting only the distinct ones).

The product of its digits is 14112, while the sum is 37.

The square root of 12779128 is about 3574.7906232394. The cubic root of 12779128 is about 233.7942038472.

The spelling of 12779128 in words is "twelve million, seven hundred seventy-nine thousand, one hundred twenty-eight".