28908881551 has 16 divisors (see below), whose sum is σ = 32920312608. Its totient is φ = 25151299200.

The previous prime is 28908881513. The next prime is 28908881581. The reversal of 28908881551 is 15518880982.

It is a cyclic number.

It is not a de Polignac number, because 28908881551 - 2²⁵ = 28875327119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28908881492 and 28908881501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28908881581) 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 15 ways as a sum of consecutive naturals, for example, 557380 + ... + 607033.

It is an arithmetic number, because the mean of its divisors is an integer number (2057519538).

Almost surely, 2^28908881551 is an apocalyptic number.

28908881551 is a deficient number, since it is larger than the sum of its proper divisors (4011431057).

28908881551 is a wasteful number, since it uses less digits than its factorization.

28908881551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1164522.

The product of its (nonzero) digits is 1843200, while the sum is 55.

The spelling of 28908881551 in words is "twenty-eight billion, nine hundred eight million, eight hundred eighty-one thousand, five hundred fifty-one".