28521811768 has 16 divisors (see below), whose sum is σ = 54155340000. Its totient is φ = 14080387776.

The previous prime is 28521811763. The next prime is 28521811841. The reversal of 28521811768 is 86711812582.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28521811763) 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, 22564093 + ... + 22565356.

It is an arithmetic number, because the mean of its divisors is an integer number (3384708750).

Almost surely, 2^28521811768 is an apocalyptic number.

It is an amenable number.

28521811768 is a deficient number, since it is larger than the sum of its proper divisors (25633528232).

28521811768 is a wasteful number, since it uses less digits than its factorization.

28521811768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45129534 (or 45129530 counting only the distinct ones).

The product of its digits is 430080, while the sum is 49.

The spelling of 28521811768 in words is "twenty-eight billion, five hundred twenty-one million, eight hundred eleven thousand, seven hundred sixty-eight".