28155802226 has 4 divisors (see below), whose sum is σ = 42233703342. Its totient is φ = 14077901112.

The previous prime is 28155802223. The next prime is 28155802303. The reversal of 28155802226 is 62220855182.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 62220855182 = 2 ⋅31110427591.

It can be written as a sum of positive squares in only one way, i.e., 28151806225 + 3996001 = 167785^2 + 1999^2 .

It is not an unprimeable number, because it can be changed into a prime (28155802223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7038950555 + ... + 7038950558.

Almost surely, 2^28155802226 is an apocalyptic number.

28155802226 is a deficient number, since it is larger than the sum of its proper divisors (14077901116).

28155802226 is a wasteful number, since it uses less digits than its factorization.

28155802226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14077901115.

The product of its (nonzero) digits is 153600, while the sum is 41.

The spelling of 28155802226 in words is "twenty-eight billion, one hundred fifty-five million, eight hundred two thousand, two hundred twenty-six".