28991744544 has 288 divisors, whose sum is σ = 91155093120. Its totient is φ = 8041033728.

The previous prime is 28991744519. The next prime is 28991744557. The reversal of 28991744544 is 44544719982.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 25678572 + ... + 25679700.

It is an arithmetic number, because the mean of its divisors is an integer number (316510740).

Almost surely, 2^28991744544 is an apocalyptic number.

28991744544 is a gapful number since it is divisible by the number (24) 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 28991744544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45577546560).

28991744544 is an abundant number, since it is smaller than the sum of its proper divisors (62163348576).

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

28991744544 is a wasteful number, since it uses less digits than its factorization.

28991744544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1312 (or 1297 counting only the distinct ones).

The product of its digits is 11612160, while the sum is 57.

The spelling of 28991744544 in words is "twenty-eight billion, nine hundred ninety-one million, seven hundred forty-four thousand, five hundred forty-four".