28236769445 has 8 divisors (see below), whose sum is σ = 35052541560. Its totient is φ = 21810470080.

The previous prime is 28236769441. The next prime is 28236769493. The reversal of 28236769445 is 54496763282.

It is a Cunningham number, because it is equal to 168038²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 1 + 28236769444 = 1^2 + 168038^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28236769445 - 2² = 28236769441 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28236769441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97368026 + ... + 97368315.

It is an arithmetic number, because the mean of its divisors is an integer number (4381567695).

Almost surely, 2^28236769445 is an apocalyptic number.

It is an amenable number.

28236769445 is a deficient number, since it is larger than the sum of its proper divisors (6815772115).

28236769445 is a wasteful number, since it uses less digits than its factorization.

28236769445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194736375.

The product of its digits is 17418240, while the sum is 56.

The spelling of 28236769445 in words is "twenty-eight billion, two hundred thirty-six million, seven hundred sixty-nine thousand, four hundred forty-five".