28658938 has 16 divisors (see below), whose sum is σ = 53596224. Its totient is φ = 11165760.

The previous prime is 28658933. The next prime is 28658939. The reversal of 28658938 is 83985682.

It is a junction number, because it is equal to n+sod(n) for n = 28658891 and 28658900.

It is not an unprimeable number, because it can be changed into a prime (28658933) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 92895 + ... + 93202.

It is an arithmetic number, because the mean of its divisors is an integer number (3349764).

Almost surely, 2^28658938 is an apocalyptic number.

28658938 is a deficient number, since it is larger than the sum of its proper divisors (24937286).

28658938 is a wasteful number, since it uses less digits than its factorization.

28658938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186117.

The product of its digits is 829440, while the sum is 49.

The square root of 28658938 is about 5353.4043374287. The cubic root of 28658938 is about 306.0225039340.

The spelling of 28658938 in words is "twenty-eight million, six hundred fifty-eight thousand, nine hundred thirty-eight".