28670242 has 4 divisors (see below), whose sum is σ = 43005366. Its totient is φ = 14335120.

The previous prime is 28670209. The next prime is 28670261. The reversal of 28670242 is 24207682.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24207682 = 2 ⋅12103841.

It can be written as a sum of positive squares in only one way, i.e., 23512801 + 5157441 = 4849^2 + 2271^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7167559 + ... + 7167562.

Almost surely, 2^28670242 is an apocalyptic number.

28670242 is a deficient number, since it is larger than the sum of its proper divisors (14335124).

28670242 is a wasteful number, since it uses less digits than its factorization.

28670242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14335123.

The product of its (nonzero) digits is 10752, while the sum is 31.

The square root of 28670242 is about 5354.4600101224. The cubic root of 28670242 is about 306.0627336600.

The spelling of 28670242 in words is "twenty-eight million, six hundred seventy thousand, two hundred forty-two".