28907332852878 has 128 divisors (see below), whose sum is σ = 66581759462400. Its totient is φ = 9289352958336.

The previous prime is 28907332852861. The next prime is 28907332852939. The reversal of 28907332852878 is 87825823370982.

It is a happy number.

28907332852878 is a `hidden beast` number, since 2 + 8 + 9 + 0 + 7 + 3 + 3 + 28 + 528 + 78 = 666.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 139590700 + ... + 139797632.

It is an arithmetic number, because the mean of its divisors is an integer number (520169995800).

Almost surely, 2^{28907332852878} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28907332852878, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33290879731200).

28907332852878 is an abundant number, since it is smaller than the sum of its proper divisors (37674426609522).

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

28907332852878 is a wasteful number, since it uses less digits than its factorization.

28907332852878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207623 (or 207617 counting only the distinct ones).

The product of its (nonzero) digits is 650280960, while the sum is 72.

The spelling of 28907332852878 in words is "twenty-eight trillion, nine hundred seven billion, three hundred thirty-two million, eight hundred fifty-two thousand, eight hundred seventy-eight".