28129012 has 12 divisors (see below), whose sum is σ = 49960960. Its totient is φ = 13854456.

The previous prime is 28129007. The next prime is 28129021. The reversal of 28129012 is 21092182.

It is a super-2 number, since 2×28129012² = 1582482632192288, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52212 + ... + 52747.

Almost surely, 2^28129012 is an apocalyptic number.

It is an amenable number.

28129012 is a deficient number, since it is larger than the sum of its proper divisors (21831948).

28129012 is a wasteful number, since it uses less digits than its factorization.

28129012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105030 (or 105028 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 28129012 is about 5303.6791003981. The cubic root of 28129012 is about 304.1245594138.

The spelling of 28129012 in words is "twenty-eight million, one hundred twenty-nine thousand, twelve".