28733387648 has 64 divisors (see below), whose sum is σ = 65680917120. Its totient is φ = 12265152000.

The previous prime is 28733387609. The next prime is 28733387651. The reversal of 28733387648 is 84678333782.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 161015 + ... + 288777.

It is an arithmetic number, because the mean of its divisors is an integer number (1026264330).

Almost surely, 2^28733387648 is an apocalyptic number.

28733387648 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 28733387648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32840458560).

28733387648 is an abundant number, since it is smaller than the sum of its proper divisors (36947529472).

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

28733387648 is a wasteful number, since it uses less digits than its factorization.

28733387648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128035 (or 128023 counting only the distinct ones).

The product of its digits is 32514048, while the sum is 59.

The spelling of 28733387648 in words is "twenty-eight billion, seven hundred thirty-three million, three hundred eighty-seven thousand, six hundred forty-eight".