28081818516 has 24 divisors (see below), whose sum is σ = 67295169760. Its totient is φ = 9107616672.

The previous prime is 28081818511. The next prime is 28081818517. The reversal of 28081818516 is 61581818082.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28081818511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31623226 + ... + 31624113.

Almost surely, 2^28081818516 is an apocalyptic number.

It is an amenable number.

28081818516 is an abundant number, since it is smaller than the sum of its proper divisors (39213351244).

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

28081818516 is a wasteful number, since it uses less digits than its factorization.

28081818516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63247383 (or 63247381 counting only the distinct ones).

The product of its (nonzero) digits is 245760, while the sum is 48.

The spelling of 28081818516 in words is "twenty-eight billion, eighty-one million, eight hundred eighteen thousand, five hundred sixteen".