28981912624 has 80 divisors (see below), whose sum is σ = 65728650240. Its totient is φ = 12120514560.

The previous prime is 28981912621. The next prime is 28981912643. The reversal of 28981912624 is 42621918982.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (28981912621) 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 15 ways as a sum of consecutive naturals, for example, 6783609 + ... + 6787879.

It is an arithmetic number, because the mean of its divisors is an integer number (821608128).

Almost surely, 2^28981912624 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 28981912624, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32864325120).

28981912624 is an abundant number, since it is smaller than the sum of its proper divisors (36746737616).

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

28981912624 is a wasteful number, since it uses less digits than its factorization.

28981912624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5738 (or 5732 counting only the distinct ones).

The product of its digits is 995328, while the sum is 52.

The spelling of 28981912624 in words is "twenty-eight billion, nine hundred eighty-one million, nine hundred twelve thousand, six hundred twenty-four".