28081627791 has 96 divisors (see below), whose sum is σ = 46070759424. Its totient is φ = 14885164800.

The previous prime is 28081627703. The next prime is 28081627823. The reversal of 28081627791 is 19772618082.

It is not a de Polignac number, because 28081627791 - 2¹⁰ = 28081626767 is a prime.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28081627991) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 73319986 + ... + 73320368.

It is an arithmetic number, because the mean of its divisors is an integer number (479903744).

Almost surely, 2^28081627791 is an apocalyptic number.

28081627791 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

28081627791 is a deficient number, since it is larger than the sum of its proper divisors (17989131633).

28081627791 is a wasteful number, since it uses less digits than its factorization.

28081627791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 573 (or 532 counting only the distinct ones).

The product of its (nonzero) digits is 677376, while the sum is 51.

The spelling of 28081627791 in words is "twenty-eight billion, eighty-one million, six hundred twenty-seven thousand, seven hundred ninety-one".