28891838 has 8 divisors (see below), whose sum is σ = 43784832. Its totient is φ = 14296896.

The previous prime is 28891813. The next prime is 28891847. The reversal of 28891838 is 83819882.

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

It is a junction number, because it is equal to n+sod(n) for n = 28891792 and 28891801.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74270 + ... + 74657.

It is an arithmetic number, because the mean of its divisors is an integer number (5473104).

Almost surely, 2^28891838 is an apocalyptic number.

28891838 is a deficient number, since it is larger than the sum of its proper divisors (14892994).

28891838 is a wasteful number, since it uses less digits than its factorization.

28891838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149026.

The product of its digits is 221184, while the sum is 47.

The square root of 28891838 is about 5375.1128360249. The cubic root of 28891838 is about 306.8492435690.

The spelling of 28891838 in words is "twenty-eight million, eight hundred ninety-one thousand, eight hundred thirty-eight".