28385078220 has 36 divisors (see below), whose sum is σ = 86101404480. Its totient is φ = 7569354144.

The previous prime is 28385078209. The next prime is 28385078261. The reversal of 28385078220 is 2287058382.

28385078220 is a `hidden beast` number, since 283 + 85 + 0 + 78 + 220 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 78847260 + ... + 78847619.

It is an arithmetic number, because the mean of its divisors is an integer number (2391705680).

Almost surely, 2^28385078220 is an apocalyptic number.

28385078220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28385078220 is an abundant number, since it is smaller than the sum of its proper divisors (57716326260).

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

28385078220 is a wasteful number, since it uses less digits than its factorization.

28385078220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157694894 (or 157694889 counting only the distinct ones).

The product of its (nonzero) digits is 430080, while the sum is 45.

The spelling of 28385078220 in words is "twenty-eight billion, three hundred eighty-five million, seventy-eight thousand, two hundred twenty".