28971310648 has 128 divisors (see below), whose sum is σ = 70195507200. Its totient is φ = 10918656000.

The previous prime is 28971310639. The next prime is 28971310649. The reversal of 28971310648 is 84601317982.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28971310649) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 838923 + ... + 872773.

It is an arithmetic number, because the mean of its divisors is an integer number (548402400).

Almost surely, 2^28971310648 is an apocalyptic number.

28971310648 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28971310648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35097753600).

28971310648 is an abundant number, since it is smaller than the sum of its proper divisors (41224196552).

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

28971310648 is a wasteful number, since it uses less digits than its factorization.

28971310648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33941 (or 33937 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 49.

The spelling of 28971310648 in words is "twenty-eight billion, nine hundred seventy-one million, three hundred ten thousand, six hundred forty-eight".