28425138 has 32 divisors (see below), whose sum is σ = 66078720. Its totient is φ = 7983120.

The previous prime is 28425127. The next prime is 28425143. The reversal of 28425138 is 83152482.

It is a junction number, because it is equal to n+sod(n) for n = 28425099 and 28425108.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3258 + ... + 8213.

It is an arithmetic number, because the mean of its divisors is an integer number (2064960).

Almost surely, 2^28425138 is an apocalyptic number.

28425138 is an abundant number, since it is smaller than the sum of its proper divisors (37653582).

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

28425138 is a wasteful number, since it uses less digits than its factorization.

28425138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11542.

The product of its digits is 15360, while the sum is 33.

The square root of 28425138 is about 5331.5230469351. The cubic root of 28425138 is about 305.1880520852.

The spelling of 28425138 in words is "twenty-eight million, four hundred twenty-five thousand, one hundred thirty-eight".