28288738207 has 4 divisors (see below), whose sum is σ = 28436846976. Its totient is φ = 28140629440.

The previous prime is 28288738169. The next prime is 28288738211. The reversal of 28288738207 is 70283788282.

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

It is a cyclic number.

It is not a de Polignac number, because 28288738207 - 2¹¹ = 28288736159 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28288738237) 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, 74054098 + ... + 74054479.

It is an arithmetic number, because the mean of its divisors is an integer number (7109211744).

Almost surely, 2^28288738207 is an apocalyptic number.

28288738207 is a deficient number, since it is larger than the sum of its proper divisors (148108769).

28288738207 is a wasteful number, since it uses less digits than its factorization.

28288738207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148108768.

The product of its (nonzero) digits is 4816896, while the sum is 55.

The spelling of 28288738207 in words is "twenty-eight billion, two hundred eighty-eight million, seven hundred thirty-eight thousand, two hundred seven".