28630138 has 8 divisors (see below), whose sum is σ = 42977088. Its totient is φ = 14304444.

The previous prime is 28630127. The next prime is 28630139. The reversal of 28630138 is 83103682.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (28630139) 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, 1356 + ... + 7687.

It is an arithmetic number, because the mean of its divisors is an integer number (5372136).

Almost surely, 2^28630138 is an apocalyptic number.

28630138 is a deficient number, since it is larger than the sum of its proper divisors (14346950).

28630138 is a wasteful number, since it uses less digits than its factorization.

28630138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10628.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 28630138 is about 5350.7137841600. The cubic root of 28630138 is about 305.9199599849.

The spelling of 28630138 in words is "twenty-eight million, six hundred thirty thousand, one hundred thirty-eight".