28949181113 has 4 divisors (see below), whose sum is σ = 28951751808. Its totient is φ = 28946610420.

The previous prime is 28949181103. The next prime is 28949181139. The reversal of 28949181113 is 31118194982.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28949181113 - 2⁶ = 28949181049 is a prime.

It is a super-2 number, since 2×28949181113² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28949181103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1268381 + ... + 1291002.

It is an arithmetic number, because the mean of its divisors is an integer number (7237937952).

Almost surely, 2^28949181113 is an apocalyptic number.

It is an amenable number.

28949181113 is a deficient number, since it is larger than the sum of its proper divisors (2570695).

28949181113 is a wasteful number, since it uses less digits than its factorization.

28949181113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2570694.

The product of its digits is 124416, while the sum is 47.

The spelling of 28949181113 in words is "twenty-eight billion, nine hundred forty-nine million, one hundred eighty-one thousand, one hundred thirteen".