28449640852 has 6 divisors (see below), whose sum is σ = 49786871498. Its totient is φ = 14224820424.

The previous prime is 28449640847. The next prime is 28449640853. The reversal of 28449640852 is 25804694482.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 21574909456 + 6874731396 = 146884^2 + 82914^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 28449640852.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28449640853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3556205103 + ... + 3556205110.

Almost surely, 2^28449640852 is an apocalyptic number.

It is an amenable number.

28449640852 is a deficient number, since it is larger than the sum of its proper divisors (21337230646).

28449640852 is a wasteful number, since it uses less digits than its factorization.

28449640852 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7112410217 (or 7112410215 counting only the distinct ones).

The product of its (nonzero) digits is 4423680, while the sum is 52.

The spelling of 28449640852 in words is "twenty-eight billion, four hundred forty-nine million, six hundred forty thousand, eight hundred fifty-two".