28393920202 has 4 divisors (see below), whose sum is σ = 42590880306. Its totient is φ = 14196960100.

The previous prime is 28393920157. The next prime is 28393920209. The reversal of 28393920202 is 20202939382.

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., 19168125601 + 9225794601 = 138449^2 + 96051^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (28393920209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7098480049 + ... + 7098480052.

Almost surely, 2^28393920202 is an apocalyptic number.

28393920202 is a deficient number, since it is larger than the sum of its proper divisors (14196960104).

28393920202 is a wasteful number, since it uses less digits than its factorization.

28393920202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14196960103.

The product of its (nonzero) digits is 93312, while the sum is 40.

The spelling of 28393920202 in words is "twenty-eight billion, three hundred ninety-three million, nine hundred twenty thousand, two hundred two".