28748131578 has 128 divisors (see below), whose sum is σ = 67709952000. Its totient is φ = 9026458560.

The previous prime is 28748131543. The next prime is 28748131579. The reversal of 28748131578 is 87513184782.

28748131578 is a `hidden beast` number, since 2 + 8 + 7 + 481 + 3 + 157 + 8 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (28748131579) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 45559323 + ... + 45559953.

It is an arithmetic number, because the mean of its divisors is an integer number (528984000).

Almost surely, 2^28748131578 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28748131578, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33854976000).

28748131578 is an abundant number, since it is smaller than the sum of its proper divisors (38961820422).

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

28748131578 is a wasteful number, since it uses less digits than its factorization.

28748131578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1337 (or 1331 counting only the distinct ones).

The product of its digits is 3010560, while the sum is 54.

The spelling of 28748131578 in words is "twenty-eight billion, seven hundred forty-eight million, one hundred thirty-one thousand, five hundred seventy-eight".