28581279752 has 8 divisors (see below), whose sum is σ = 53589899550. Its totient is φ = 14290639872.

The previous prime is 28581279721. The next prime is 28581279757. The reversal of 28581279752 is 25797218582.

It can be written as a sum of positive squares in only one way, i.e., 20040932356 + 8540347396 = 141566^2 + 92414^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (28581279757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1786329977 + ... + 1786329992.

Almost surely, 2^28581279752 is an apocalyptic number.

It is an amenable number.

28581279752 is a deficient number, since it is larger than the sum of its proper divisors (25008619798).

28581279752 is a wasteful number, since it uses less digits than its factorization.

28581279752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3572659975 (or 3572659971 counting only the distinct ones).

The product of its digits is 5644800, while the sum is 56.

The spelling of 28581279752 in words is "twenty-eight billion, five hundred eighty-one million, two hundred seventy-nine thousand, seven hundred fifty-two".