28349799145 has 4 divisors (see below), whose sum is σ = 34019758980. Its totient is φ = 22679839312.

The previous prime is 28349799113. The next prime is 28349799151. The reversal of 28349799145 is 54199794382.

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

It can be written as a sum of positive squares in 2 ways, for example, as 8495861929 + 19853937216 = 92173^2 + 140904^2 .

It is a cyclic number.

It is not a de Polignac number, because 28349799145 - 2⁵ = 28349799113 is a prime.

It is a super-2 number, since 2×28349799145² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2834979910 + ... + 2834979919.

It is an arithmetic number, because the mean of its divisors is an integer number (8504939745).

Almost surely, 2^28349799145 is an apocalyptic number.

It is an amenable number.

28349799145 is a deficient number, since it is larger than the sum of its proper divisors (5669959835).

28349799145 is an equidigital number, since it uses as much as digits as its factorization.

28349799145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5669959834.

The product of its digits is 19595520, while the sum is 61.

The spelling of 28349799145 in words is "twenty-eight billion, three hundred forty-nine million, seven hundred ninety-nine thousand, one hundred forty-five".