28705351836 has 192 divisors, whose sum is σ = 83642388480. Its totient is φ = 7476019200.

The previous prime is 28705351777. The next prime is 28705351841. The reversal of 28705351836 is 63815350782.

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, 5976636 + ... + 5981436.

It is an arithmetic number, because the mean of its divisors is an integer number (435637440).

Almost surely, 2^28705351836 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 28705351836, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41821194240).

28705351836 is an abundant number, since it is smaller than the sum of its proper divisors (54937036644).

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

28705351836 is a wasteful number, since it uses less digits than its factorization.

28705351836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4964 (or 4962 counting only the distinct ones).

The product of its (nonzero) digits is 1209600, while the sum is 48.

The spelling of 28705351836 in words is "twenty-eight billion, seven hundred five million, three hundred fifty-one thousand, eight hundred thirty-six".