28420202 has 4 divisors (see below), whose sum is σ = 42630306. Its totient is φ = 14210100.

The previous prime is 28420201. The next prime is 28420213. The reversal of 28420202 is 20202482.

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., 25290841 + 3129361 = 5029^2 + 1769^2 .

It is not an unprimeable number, because it can be changed into a prime (28420201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7105049 + ... + 7105052.

Almost surely, 2^28420202 is an apocalyptic number.

28420202 is a deficient number, since it is larger than the sum of its proper divisors (14210104).

28420202 is a wasteful number, since it uses less digits than its factorization.

28420202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14210103.

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

The square root of 28420202 is about 5331.0601197135. The cubic root of 28420202 is about 305.1703858510.

Adding to 28420202 its reverse (20202482), we get a palindrome (48622684).

The spelling of 28420202 in words is "twenty-eight million, four hundred twenty thousand, two hundred two".