28207136633 has 4 divisors (see below), whose sum is σ = 30376916388. Its totient is φ = 26037356880.

The previous prime is 28207136567. The next prime is 28207136693. The reversal of 28207136633 is 33663170282.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5619451369 + 22587685264 = 74963^2 + 150292^2 .

It is a cyclic number.

It is not a de Polignac number, because 28207136633 - 2¹⁶ = 28207071097 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28207136693) 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, 1084889858 + ... + 1084889883.

It is an arithmetic number, because the mean of its divisors is an integer number (7594229097).

Almost surely, 2^28207136633 is an apocalyptic number.

It is an amenable number.

28207136633 is a deficient number, since it is larger than the sum of its proper divisors (2169779755).

28207136633 is a wasteful number, since it uses less digits than its factorization.

28207136633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2169779754.

The product of its (nonzero) digits is 217728, while the sum is 41.

The spelling of 28207136633 in words is "twenty-eight billion, two hundred seven million, one hundred thirty-six thousand, six hundred thirty-three".