28788353444 has 12 divisors (see below), whose sum is σ = 50393495964. Its totient is φ = 14390211744.

The previous prime is 28788353383. The next prime is 28788353449. The reversal of 28788353444 is 44435388782.

It can be written as a sum of positive squares in 2 ways, for example, as 9275616100 + 19512737344 = 96310^2 + 139688^2 .

It is a super-2 number, since 2×28788353444² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28788353444.

It is not an unprimeable number, because it can be changed into a prime (28788353449) 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, 974879 + ... + 1003974.

It is an arithmetic number, because the mean of its divisors is an integer number (4199457997).

Almost surely, 2^28788353444 is an apocalyptic number.

It is an amenable number.

28788353444 is a deficient number, since it is larger than the sum of its proper divisors (21605142520).

28788353444 is a wasteful number, since it uses less digits than its factorization.

28788353444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1982494 (or 1982492 counting only the distinct ones).

The product of its digits is 20643840, while the sum is 56.

The spelling of 28788353444 in words is "twenty-eight billion, seven hundred eighty-eight million, three hundred fifty-three thousand, four hundred forty-four".