28129867782 has 8 divisors (see below), whose sum is σ = 56259735576. Its totient is φ = 9376622592.

The previous prime is 28129867769. The next prime is 28129867793. The reversal of 28129867782 is 28776892182.

It is a sphenic number, since it is the product of 3 distinct primes.

28129867782 is an admirable number.

It is a super-2 number, since 2×28129867782² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2344155643 + ... + 2344155654.

It is an arithmetic number, because the mean of its divisors is an integer number (7032466947).

Almost surely, 2^28129867782 is an apocalyptic number.

28129867782 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

28129867782 is a wasteful number, since it uses less digits than its factorization.

28129867782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4688311302.

The product of its digits is 10838016, while the sum is 60.

The spelling of 28129867782 in words is "twenty-eight billion, one hundred twenty-nine million, eight hundred sixty-seven thousand, seven hundred eighty-two".