28112820417 has 48 divisors (see below), whose sum is σ = 46569327168. Its totient is φ = 16804558080.

The previous prime is 28112820401. The next prime is 28112820467. The reversal of 28112820417 is 71402821182.

It is a happy number.

It is not a de Polignac number, because 28112820417 - 2⁴ = 28112820401 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28112820467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 123093 + ... + 267165.

It is an arithmetic number, because the mean of its divisors is an integer number (970194316).

Almost surely, 2^28112820417 is an apocalyptic number.

28112820417 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

28112820417 is a deficient number, since it is larger than the sum of its proper divisors (18456506751).

28112820417 is a wasteful number, since it uses less digits than its factorization.

28112820417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144172 (or 144160 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 36.

The spelling of 28112820417 in words is "twenty-eight billion, one hundred twelve million, eight hundred twenty thousand, four hundred seventeen".