28638412 has 12 divisors (see below), whose sum is σ = 54673416. Its totient is φ = 13017440.

The previous prime is 28638409. The next prime is 28638419. The reversal of 28638412 is 21483682.

It is not an unprimeable number, because it can be changed into a prime (28638419) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 325393 + ... + 325480.

It is an arithmetic number, because the mean of its divisors is an integer number (4556118).

Almost surely, 2^28638412 is an apocalyptic number.

28638412 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

28638412 is a deficient number, since it is larger than the sum of its proper divisors (26035004).

28638412 is a wasteful number, since it uses less digits than its factorization.

28638412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 650888 (or 650886 counting only the distinct ones).

The product of its digits is 18432, while the sum is 34.

The square root of 28638412 is about 5351.4868961813. The cubic root of 28638412 is about 305.9494270446.

The spelling of 28638412 in words is "twenty-eight million, six hundred thirty-eight thousand, four hundred twelve".