28902138 has 16 divisors (see below), whose sum is σ = 58066176. Its totient is φ = 9590400.

The previous prime is 28902121. The next prime is 28902157. The reversal of 28902138 is 83120982.

It is a junction number, because it is equal to n+sod(n) for n = 28902099 and 28902108.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9463 + ... + 12138.

It is an arithmetic number, because the mean of its divisors is an integer number (3629136).

Almost surely, 2^28902138 is an apocalyptic number.

28902138 is an abundant number, since it is smaller than the sum of its proper divisors (29164038).

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

28902138 is a wasteful number, since it uses less digits than its factorization.

28902138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21829.

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 28902138 is about 5376.0708700686. The cubic root of 28902138 is about 306.8857033666.

The spelling of 28902138 in words is "twenty-eight million, nine hundred two thousand, one hundred thirty-eight".