28861631634 has 64 divisors (see below), whose sum is σ = 64361889792. Its totient is φ = 8554694400.

The previous prime is 28861631609. The next prime is 28861631647. The reversal of 28861631634 is 43613616882.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 570874 + ... + 619370.

It is an arithmetic number, because the mean of its divisors is an integer number (1005654528).

Almost surely, 2^28861631634 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28861631634, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32180944896).

28861631634 is an abundant number, since it is smaller than the sum of its proper divisors (35500258158).

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

28861631634 is a wasteful number, since it uses less digits than its factorization.

28861631634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48711.

The product of its digits is 995328, while the sum is 48.

The spelling of 28861631634 in words is "twenty-eight billion, eight hundred sixty-one million, six hundred thirty-one thousand, six hundred thirty-four".