28081642272 has 48 divisors (see below), whose sum is σ = 74063721312. Its totient is φ = 9316177920.

The previous prime is 28081642261. The next prime is 28081642273. The reversal of 28081642272 is 27224618082.

It is a tau number, because it is divible by the number of its divisors (48).

It is not an unprimeable number, because it can be changed into a prime (28081642273) 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, 672913 + ... + 713424.

It is an arithmetic number, because the mean of its divisors is an integer number (1542994194).

Almost surely, 2^28081642272 is an apocalyptic number.

It is an amenable number.

28081642272 is an abundant number, since it is smaller than the sum of its proper divisors (45982079040).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28081642272 is a wasteful number, since it uses less digits than its factorization.

28081642272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1386561 (or 1386553 counting only the distinct ones).

The product of its (nonzero) digits is 172032, while the sum is 42.

The spelling of 28081642272 in words is "twenty-eight billion, eighty-one million, six hundred forty-two thousand, two hundred seventy-two".