28198335667 has 4 divisors (see below), whose sum is σ = 28210743720. Its totient is φ = 28185927616.

The previous prime is 28198335637. The next prime is 28198335677. The reversal of 28198335667 is 76653389182.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28198335667 is a prime.

It is a super-2 number, since 2×28198335667² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28198335637) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6200617 + ... + 6205162.

It is an arithmetic number, because the mean of its divisors is an integer number (7052685930).

Almost surely, 2^28198335667 is an apocalyptic number.

28198335667 is a deficient number, since it is larger than the sum of its proper divisors (12408053).

28198335667 is a wasteful number, since it uses less digits than its factorization.

28198335667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12408052.

The product of its digits is 13063680, while the sum is 58.

The spelling of 28198335667 in words is "twenty-eight billion, one hundred ninety-eight million, three hundred thirty-five thousand, six hundred sixty-seven".