28111041247 has 4 divisors (see below), whose sum is σ = 28114274080. Its totient is φ = 28107808416.

The previous prime is 28111041199. The next prime is 28111041251. The reversal of 28111041247 is 74214011182.

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-28111041247 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 (28111041547) 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, 1603338 + ... + 1620775.

It is an arithmetic number, because the mean of its divisors is an integer number (7028568520).

Almost surely, 2^28111041247 is an apocalyptic number.

28111041247 is a deficient number, since it is larger than the sum of its proper divisors (3232833).

28111041247 is an equidigital number, since it uses as much as digits as its factorization.

28111041247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3232832.

The product of its (nonzero) digits is 3584, while the sum is 31.

The spelling of 28111041247 in words is "twenty-eight billion, one hundred eleven million, forty-one thousand, two hundred forty-seven".