28229938 has 8 divisors (see below), whose sum is σ = 46194480. Its totient is φ = 12831780.

The previous prime is 28229923. The next prime is 28229969. The reversal of 28229938 is 83992282.

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 = 28229894 and 28229903.

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, 641568 + ... + 641611.

It is an arithmetic number, because the mean of its divisors is an integer number (5774310).

Almost surely, 2^28229938 is an apocalyptic number.

28229938 is a deficient number, since it is larger than the sum of its proper divisors (17964542).

28229938 is a wasteful number, since it uses less digits than its factorization.

28229938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1283192.

The product of its digits is 124416, while the sum is 43.

The square root of 28229938 is about 5313.1852969758. The cubic root of 28229938 is about 304.4878550092.

The spelling of 28229938 in words is "twenty-eight million, two hundred twenty-nine thousand, nine hundred thirty-eight".