28081628073 has 16 divisors (see below), whose sum is σ = 43411213440. Its totient is φ = 17907124752.

The previous prime is 28081628017. The next prime is 28081628111. The reversal of 28081628073 is 37082618082.

It is not a de Polignac number, because 28081628073 - 2²⁶ = 28014519209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28081628273) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22609386 + ... + 22610627.

It is an arithmetic number, because the mean of its divisors is an integer number (2713200840).

Almost surely, 2^28081628073 is an apocalyptic number.

28081628073 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

28081628073 is a deficient number, since it is larger than the sum of its proper divisors (15329585367).

28081628073 is a wasteful number, since it uses less digits than its factorization.

28081628073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45220045 (or 45220039 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 45.

Subtracting 28081628073 from its reverse (37082618082), we obtain a palindrome (9000990009).

The spelling of 28081628073 in words is "twenty-eight billion, eighty-one million, six hundred twenty-eight thousand, seventy-three".