28503842 has 4 divisors (see below), whose sum is σ = 42755766. Its totient is φ = 14251920.

The previous prime is 28503841. The next prime is 28503847. The reversal of 28503842 is 24830582.

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., 14523721 + 13980121 = 3811^2 + 3739^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28503799 and 28503808.

It is not an unprimeable number, because it can be changed into a prime (28503841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7125959 + ... + 7125962.

Almost surely, 2^28503842 is an apocalyptic number.

28503842 is a deficient number, since it is larger than the sum of its proper divisors (14251924).

28503842 is a wasteful number, since it uses less digits than its factorization.

28503842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14251923.

The product of its (nonzero) digits is 15360, while the sum is 32.

The square root of 28503842 is about 5338.8989501582. The cubic root of 28503842 is about 305.4694624567.

Subtracting from 28503842 its product of nonzero digits (15360), we obtain a palindrome (28488482).

The spelling of 28503842 in words is "twenty-eight million, five hundred three thousand, eight hundred forty-two".