28386897408 has 240 divisors, whose sum is σ = 89028825600. Its totient is φ = 8674283520.

The previous prime is 28386897403. The next prime is 28386897421. The reversal of 28386897408 is 80479868382.

28386897408 is a `hidden beast` number, since 2 + 83 + 8 + 68 + 97 + 408 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28386897403) 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 23 ways as a sum of consecutive naturals, for example, 2708883 + ... + 2719341.

It is an arithmetic number, because the mean of its divisors is an integer number (370953440).

Almost surely, 2^28386897408 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28386897408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44514412800).

28386897408 is an abundant number, since it is smaller than the sum of its proper divisors (60641928192).

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

28386897408 is a wasteful number, since it uses less digits than its factorization.

28386897408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10533 (or 10514 counting only the distinct ones).

The product of its (nonzero) digits is 37158912, while the sum is 63.

The spelling of 28386897408 in words is "twenty-eight billion, three hundred eighty-six million, eight hundred ninety-seven thousand, four hundred eight".