28685859552 has 144 divisors (see below), whose sum is σ = 93698841600. Its totient is φ = 8154660096.

The previous prime is 28685859533. The next prime is 28685859557. The reversal of 28685859552 is 25595858682.

28685859552 is a `hidden beast` number, since 28 + 6 + 8 + 5 + 8 + 59 + 552 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a self number, because there is not a number n which added to its sum of digits gives 28685859552.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28685859557) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 365433 + ... + 436935.

It is an arithmetic number, because the mean of its divisors is an integer number (650686400).

Almost surely, 2^28685859552 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28685859552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46849420800).

28685859552 is an abundant number, since it is smaller than the sum of its proper divisors (65012982048).

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

28685859552 is a wasteful number, since it uses less digits than its factorization.

28685859552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71725 (or 71714 counting only the distinct ones).

The product of its digits is 69120000, while the sum is 63.

The spelling of 28685859552 in words is "twenty-eight billion, six hundred eighty-five million, eight hundred fifty-nine thousand, five hundred fifty-two".