181272321420428 has 96 divisors (see below), whose sum is σ = 383805780019200. Its totient is φ = 73179363430656.

The previous prime is 181272321420413. The next prime is 181272321420517. The reversal of 181272321420428 is 824024123272181.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 165358418 + ... + 166451046.

It is an arithmetic number, because the mean of its divisors is an integer number (3997976875200).

Almost surely, 2^{181272321420428} 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 181272321420428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (191902890009600).

181272321420428 is an abundant number, since it is smaller than the sum of its proper divisors (202533458598772).

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

181272321420428 is a wasteful number, since it uses less digits than its factorization.

181272321420428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1094439 (or 1094437 counting only the distinct ones).

The product of its (nonzero) digits is 688128, while the sum is 47.

The spelling of 181272321420428 in words is "one hundred eighty-one trillion, two hundred seventy-two billion, three hundred twenty-one million, four hundred twenty thousand, four hundred twenty-eight".