28440646068 has 12 divisors (see below), whose sum is σ = 66361507520. Its totient is φ = 9480215352.

The previous prime is 28440646061. The next prime is 28440646093. The reversal of 28440646068 is 86064604482.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28440646061) 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 in 3 ways as a sum of consecutive naturals, for example, 1185026908 + ... + 1185026931.

Almost surely, 2^28440646068 is an apocalyptic number.

It is an amenable number.

28440646068 is an abundant number, since it is smaller than the sum of its proper divisors (37920861452).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28440646068 is a wasteful number, since it uses less digits than its factorization.

28440646068 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2370053846 (or 2370053844 counting only the distinct ones).

The product of its (nonzero) digits is 1769472, while the sum is 48.

The spelling of 28440646068 in words is "twenty-eight billion, four hundred forty million, six hundred forty-six thousand, sixty-eight".