28893386508 has 192 divisors, whose sum is σ = 82788894720. Its totient is φ = 7664836608.

The previous prime is 28893386471. The next prime is 28893386549. The reversal of 28893386508 is 80568339882.

It is a super-4 number, since 4×28893386508⁴ (a number of 43 digits) contains 4444 as substring.

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 9930958 + ... + 9933866.

It is an arithmetic number, because the mean of its divisors is an integer number (431192160).

Almost surely, 2^28893386508 is an apocalyptic number.

28893386508 is a gapful number since it is divisible by the number (28) 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 28893386508, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41394447360).

28893386508 is an abundant number, since it is smaller than the sum of its proper divisors (53895508212).

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

28893386508 is a wasteful number, since it uses less digits than its factorization.

28893386508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3096 (or 3094 counting only the distinct ones).

The product of its (nonzero) digits is 19906560, while the sum is 60.

The spelling of 28893386508 in words is "twenty-eight billion, eight hundred ninety-three million, three hundred eighty-six thousand, five hundred eight".