28812331069 has 4 divisors (see below), whose sum is σ = 28813144444. Its totient is φ = 28811517696.

The previous prime is 28812331049. The next prime is 28812331099. The reversal of 28812331069 is 96013321882.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 96013321882 = 2 ⋅48006660941.

It can be written as a sum of positive squares in 2 ways, for example, as 11758582969 + 17053748100 = 108437^2 + 130590^2 .

It is a cyclic number.

It is not a de Polignac number, because 28812331069 - 2²¹ = 28810233917 is a prime.

It is a super-2 number, since 2×28812331069² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28812331019) 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, 351012 + ... + 425245.

It is an arithmetic number, because the mean of its divisors is an integer number (7203286111).

Almost surely, 2^28812331069 is an apocalyptic number.

It is an amenable number.

28812331069 is a deficient number, since it is larger than the sum of its proper divisors (813375).

28812331069 is an equidigital number, since it uses as much as digits as its factorization.

28812331069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 813374.

The product of its (nonzero) digits is 124416, while the sum is 43.

The spelling of 28812331069 in words is "twenty-eight billion, eight hundred twelve million, three hundred thirty-one thousand, sixty-nine".