28236769444 has 81 divisors (see below), whose sum is σ = 56135186499. Its totient is φ = 12421368960.

The previous prime is 28236769441. The next prime is 28236769493. The reversal of 28236769444 is 44496763282.

It is a happy number.

The square root of 28236769444 is 168038.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 1238336100 + 26998433344 = 35190^2 + 164312^2 .

It is a super-2 number, since 2×28236769444² (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 (28236769441) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 100486584 + ... + 100486864.

Almost surely, 2^28236769444 is an apocalyptic number.

28236769444 is the 168038-th square number.

It is an amenable number.

28236769444 is a deficient number, since it is larger than the sum of its proper divisors (27898417055).

28236769444 is a wasteful number, since it uses less digits than its factorization.

28236769444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 638 (or 319 counting only the distinct ones).

The product of its digits is 13934592, while the sum is 55.

The spelling of 28236769444 in words is "twenty-eight billion, two hundred thirty-six million, seven hundred sixty-nine thousand, four hundred forty-four".