28873121652 has 60 divisors (see below), whose sum is σ = 75686022720. Its totient is φ = 9598109904.

The previous prime is 28873121621. The next prime is 28873121659. The reversal of 28873121652 is 25612137882.

28873121652 is a `hidden beast` number, since 288 + 7 + 312 + 1 + 6 + 52 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 28873121598 and 28873121607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28873121659) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2502 + ... + 240317.

It is an arithmetic number, because the mean of its divisors is an integer number (1261433712).

Almost surely, 2^28873121652 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 28873121652, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37843011360).

28873121652 is an abundant number, since it is smaller than the sum of its proper divisors (46812901068).

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

28873121652 is a wasteful number, since it uses less digits than its factorization.

28873121652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243202 (or 243191 counting only the distinct ones).

The product of its digits is 322560, while the sum is 45.

The spelling of 28873121652 in words is "twenty-eight billion, eight hundred seventy-three million, one hundred twenty-one thousand, six hundred fifty-two".