28911067440 has 160 divisors (see below), whose sum is σ = 92844057600. Its totient is φ = 7433395200.

The previous prime is 28911067439. The next prime is 28911067453. The reversal of 28911067440 is 4476011982.

It is a junction number, because it is equal to n+sod(n) for n = 28911067392 and 28911067401.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 5836965 + ... + 5841915.

It is an arithmetic number, because the mean of its divisors is an integer number (580275360).

Almost surely, 2^28911067440 is an apocalyptic number.

28911067440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28911067440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46422028800).

28911067440 is an abundant number, since it is smaller than the sum of its proper divisors (63932990160).

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

28911067440 is a wasteful number, since it uses less digits than its factorization.

28911067440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5835 (or 5829 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 42.

The spelling of 28911067440 in words is "twenty-eight billion, nine hundred eleven million, sixty-seven thousand, four hundred forty".