28578339720 has 192 divisors, whose sum is σ = 109017342720. Its totient is φ = 6355625472.

The previous prime is 28578339703. The next prime is 28578339733. The reversal of 28578339720 is 2793387582.

28578339720 is a `hidden beast` number, since 285 + 7 + 8 + 339 + 7 + 20 = 666.

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 47 ways as a sum of consecutive naturals, for example, 60012 + ... + 246491.

It is an arithmetic number, because the mean of its divisors is an integer number (567798660).

Almost surely, 2^28578339720 is an apocalyptic number.

28578339720 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 28578339720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54508671360).

28578339720 is an abundant number, since it is smaller than the sum of its proper divisors (80439003000).

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

28578339720 is a wasteful number, since it uses less digits than its factorization.

28578339720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306564 (or 306557 counting only the distinct ones).

The product of its (nonzero) digits is 5080320, while the sum is 54.

The spelling of 28578339720 in words is "twenty-eight billion, five hundred seventy-eight million, three hundred thirty-nine thousand, seven hundred twenty".