28721791296 has 252 divisors, whose sum is σ = 93848017536. Its totient is φ = 8703002880.

The previous prime is 28721791253. The next prime is 28721791303. The reversal of 28721791296 is 69219712782.

28721791296 is a `hidden beast` number, since 287 + 2 + 1 + 79 + 1 + 296 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1874161 + ... + 1889423.

It is an arithmetic number, because the mean of its divisors is an integer number (372412768).

Almost surely, 2^28721791296 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 28721791296, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46924008768).

28721791296 is an abundant number, since it is smaller than the sum of its proper divisors (65126226240).

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

28721791296 is a wasteful number, since it uses less digits than its factorization.

28721791296 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15312 (or 15279 counting only the distinct ones).

The product of its digits is 1524096, while the sum is 54.

The spelling of 28721791296 in words is "twenty-eight billion, seven hundred twenty-one million, seven hundred ninety-one thousand, two hundred ninety-six".