28662598221 has 8 divisors (see below), whose sum is σ = 38700554880. Its totient is φ = 18866520192.

The previous prime is 28662598207. The next prime is 28662598267. The reversal of 28662598221 is 12289526682.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28662598221 - 2⁵ = 28662598189 is a prime.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28662598291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60469380 + ... + 60469853.

It is an arithmetic number, because the mean of its divisors is an integer number (4837569360).

Almost surely, 2^28662598221 is an apocalyptic number.

It is an amenable number.

28662598221 is a deficient number, since it is larger than the sum of its proper divisors (10037956659).

28662598221 is a wasteful number, since it uses less digits than its factorization.

28662598221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120939315.

The product of its digits is 1658880, while the sum is 51.

The spelling of 28662598221 in words is "twenty-eight billion, six hundred sixty-two million, five hundred ninety-eight thousand, two hundred twenty-one".