28791938 has 16 divisors (see below), whose sum is σ = 49533120. Its totient is φ = 12295536.

The previous prime is 28791937. The next prime is 28791943. The reversal of 28791938 is 83919782.

It is a junction number, because it is equal to n+sod(n) for n = 28791892 and 28791901.

It is not an unprimeable number, because it can be changed into a prime (28791937) 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, 593 + ... + 7611.

It is an arithmetic number, because the mean of its divisors is an integer number (3095820).

Almost surely, 2^28791938 is an apocalyptic number.

28791938 is a deficient number, since it is larger than the sum of its proper divisors (20741182).

28791938 is a wasteful number, since it uses less digits than its factorization.

28791938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7321.

The product of its digits is 217728, while the sum is 47.

The square root of 28791938 is about 5365.8119609245. The cubic root of 28791938 is about 306.4951684981.

The spelling of 28791938 in words is "twenty-eight million, seven hundred ninety-one thousand, nine hundred thirty-eight".