28563789870 has 192 divisors, whose sum is σ = 94562297856. Its totient is φ = 5808983040.

The previous prime is 28563789833. The next prime is 28563789893. The reversal of 28563789870 is 7898736582.

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

It is a junction number, because it is equal to n+sod(n) for n = 28563789798 and 28563789807.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 281862 + ... + 369558.

It is an arithmetic number, because the mean of its divisors is an integer number (492511968).

Almost surely, 2^28563789870 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28563789870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47281148928).

28563789870 is an abundant number, since it is smaller than the sum of its proper divisors (65998507986).

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

28563789870 is a wasteful number, since it uses less digits than its factorization.

28563789870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87775 (or 87772 counting only the distinct ones).

The product of its (nonzero) digits is 40642560, while the sum is 63.

The spelling of 28563789870 in words is "twenty-eight billion, five hundred sixty-three million, seven hundred eighty-nine thousand, eight hundred seventy".