85447981824 has 144 divisors (see below), whose sum is σ = 246395140992. Its totient is φ = 26183614464.

The previous prime is 85447981769. The next prime is 85447981847. The reversal of 85447981824 is 42818974458.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 485307 + ... + 637509.

It is an arithmetic number, because the mean of its divisors is an integer number (1711077368).

Almost surely, 2^85447981824 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 85447981824, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (123197570496).

85447981824 is an abundant number, since it is smaller than the sum of its proper divisors (160947159168).

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

85447981824 is a wasteful number, since it uses less digits than its factorization.

85447981824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152282 (or 152268 counting only the distinct ones).

The product of its digits is 20643840, while the sum is 60.

The spelling of 85447981824 in words is "eighty-five billion, four hundred forty-seven million, nine hundred eighty-one thousand, eight hundred twenty-four".