28081788651 has 48 divisors (see below), whose sum is σ = 47242690560. Its totient is φ = 15741639360.

The previous prime is 28081788643. The next prime is 28081788653. The reversal of 28081788651 is 15688718082.

It is not a de Polignac number, because 28081788651 - 2³ = 28081788643 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28081788653) 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 47 ways as a sum of consecutive naturals, for example, 1462330 + ... + 1481408.

It is an arithmetic number, because the mean of its divisors is an integer number (984222720).

Almost surely, 2^28081788651 is an apocalyptic number.

28081788651 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

28081788651 is a deficient number, since it is larger than the sum of its proper divisors (19160901909).

28081788651 is a wasteful number, since it uses less digits than its factorization.

28081788651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19536 (or 19533 counting only the distinct ones).

The product of its (nonzero) digits is 1720320, while the sum is 54.

The spelling of 28081788651 in words is "twenty-eight billion, eighty-one million, seven hundred eighty-eight thousand, six hundred fifty-one".