81422457882 has 16 divisors (see below), whose sum is σ = 172424028672. Its totient is φ = 25544300480.

The previous prime is 81422457871. The next prime is 81422457889. The reversal of 81422457882 is 28875422418.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (81422457889) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 399129594 + ... + 399129797.

It is an arithmetic number, because the mean of its divisors is an integer number (10776501792).

Almost surely, 2^81422457882 is an apocalyptic number.

81422457882 is an abundant number, since it is smaller than the sum of its proper divisors (91001570790).

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

81422457882 is a wasteful number, since it uses less digits than its factorization.

81422457882 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 798259413.

The product of its digits is 2293760, while the sum is 51.

The spelling of 81422457882 in words is "eighty-one billion, four hundred twenty-two million, four hundred fifty-seven thousand, eight hundred eighty-two".