28302939302820 has 576 divisors, whose sum is σ = 99979397038080. Its totient is φ = 5929499261952.

The previous prime is 28302939302761. The next prime is 28302939302909. The reversal of 28302939302820 is 2820393920382.

It is a super-2 number, since 2×28302939302820² (a number of 28 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 8163522727 + ... + 8163526193.

It is an arithmetic number, because the mean of its divisors is an integer number (173575342080).

Almost surely, 2^{28302939302820} is an apocalyptic number.

28302939302820 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 28302939302820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49989698519040).

28302939302820 is an abundant number, since it is smaller than the sum of its proper divisors (71676457735260).

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

28302939302820 is a wasteful number, since it uses less digits than its factorization.

28302939302820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4952 (or 4943 counting only the distinct ones).

The product of its (nonzero) digits is 2239488, while the sum is 51.

The spelling of 28302939302820 in words is "twenty-eight trillion, three hundred two billion, nine hundred thirty-nine million, three hundred two thousand, eight hundred twenty".