28687116870 has 128 divisors (see below), whose sum is σ = 77418823680. Its totient is φ = 7558427520.

The previous prime is 28687116869. The next prime is 28687116901. The reversal of 28687116870 is 7861178682.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

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, 9016680 + ... + 9019860.

It is an arithmetic number, because the mean of its divisors is an integer number (604834560).

Almost surely, 2^28687116870 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28687116870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38709411840).

28687116870 is an abundant number, since it is smaller than the sum of its proper divisors (48731706810).

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

28687116870 is a wasteful number, since it uses less digits than its factorization.

28687116870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3587 (or 3581 counting only the distinct ones).

The product of its (nonzero) digits is 1806336, while the sum is 54.

The spelling of 28687116870 in words is "twenty-eight billion, six hundred eighty-seven million, one hundred sixteen thousand, eight hundred seventy".