28020242 has 4 divisors (see below), whose sum is σ = 42030366. Its totient is φ = 14010120.

The previous prime is 28020241. The next prime is 28020253. The reversal of 28020242 is 24202082.

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., 19616041 + 8404201 = 4429^2 + 2899^2 .

It is not an unprimeable number, because it can be changed into a prime (28020241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7005059 + ... + 7005062.

Almost surely, 2^28020242 is an apocalyptic number.

28020242 is a deficient number, since it is larger than the sum of its proper divisors (14010124).

28020242 is a wasteful number, since it uses less digits than its factorization.

28020242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14010123.

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 28020242 is about 5293.4149657853. The cubic root of 28020242 is about 303.7320541256.

The spelling of 28020242 in words is "twenty-eight million, twenty thousand, two hundred forty-two".