28248938 has 4 divisors (see below), whose sum is σ = 42373410. Its totient is φ = 14124468.

The previous prime is 28248937. The next prime is 28248943. The reversal of 28248938 is 83984282.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 19386409 + 8862529 = 4403^2 + 2977^2 .

It is not an unprimeable number, because it can be changed into a prime (28248937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7062233 + ... + 7062236.

Almost surely, 2^28248938 is an apocalyptic number.

28248938 is a deficient number, since it is larger than the sum of its proper divisors (14124472).

28248938 is a wasteful number, since it uses less digits than its factorization.

28248938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14124471.

The product of its digits is 221184, while the sum is 44.

The square root of 28248938 is about 5314.9730008722. The cubic root of 28248938 is about 304.5561509653.

The spelling of 28248938 in words is "twenty-eight million, two hundred forty-eight thousand, nine hundred thirty-eight".