28018478969 has 4 divisors (see below), whose sum is σ = 30173746596. Its totient is φ = 25863211344.

The previous prime is 28018478927. The next prime is 28018478977. The reversal of 28018478969 is 96987481082.

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 6936890944 + 21081588025 = 83288^2 + 145195^2 .

It is a cyclic number.

It is not a de Polignac number, because 28018478969 - 2³² = 23723511673 is a prime.

It is a super-2 number, since 2×28018478969² (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 (28018478909) 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, 1077633794 + ... + 1077633819.

It is an arithmetic number, because the mean of its divisors is an integer number (7543436649).

Almost surely, 2^28018478969 is an apocalyptic number.

It is an amenable number.

28018478969 is a deficient number, since it is larger than the sum of its proper divisors (2155267627).

28018478969 is a wasteful number, since it uses less digits than its factorization.

28018478969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2155267626.

The product of its (nonzero) digits is 13934592, while the sum is 62.

The spelling of 28018478969 in words is "twenty-eight billion, eighteen million, four hundred seventy-eight thousand, nine hundred sixty-nine".