28081457111 has 4 divisors (see below), whose sum is σ = 28159678800. Its totient is φ = 28003235424.

The previous prime is 28081457101. The next prime is 28081457141. The reversal of 28081457111 is 11175418082.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28081457111 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 (28081457101) 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, 39110306 + ... + 39111023.

It is an arithmetic number, because the mean of its divisors is an integer number (7039919700).

Almost surely, 2^28081457111 is an apocalyptic number.

28081457111 is a deficient number, since it is larger than the sum of its proper divisors (78221689).

28081457111 is an equidigital number, since it uses as much as digits as its factorization.

28081457111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78221688.

The product of its (nonzero) digits is 17920, while the sum is 38.

The spelling of 28081457111 in words is "twenty-eight billion, eighty-one million, four hundred fifty-seven thousand, one hundred eleven".