28142522291 has 4 divisors (see below), whose sum is σ = 30307331712. Its totient is φ = 25977712872.

The previous prime is 28142522281. The next prime is 28142522299. The reversal of 28142522291 is 19222524182.

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-28142522291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28142522299) 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, 1082404691 + ... + 1082404716.

It is an arithmetic number, because the mean of its divisors is an integer number (7576832928).

Almost surely, 2^28142522291 is an apocalyptic number.

28142522291 is a deficient number, since it is larger than the sum of its proper divisors (2164809421).

28142522291 is a wasteful number, since it uses less digits than its factorization.

28142522291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2164809420.

The product of its digits is 46080, while the sum is 38.

The spelling of 28142522291 in words is "twenty-eight billion, one hundred forty-two million, five hundred twenty-two thousand, two hundred ninety-one".