181931720448 has 72 divisors (see below), whose sum is σ = 484270432128. Its totient is φ = 60635548672.

The previous prime is 181931720431. The next prime is 181931720461. The reversal of 181931720448 is 844027139181.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a junction number, because it is equal to n+sod(n) for n = 181931720397 and 181931720406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8347261 + ... + 8369027.

It is an arithmetic number, because the mean of its divisors is an integer number (6725978224).

Almost surely, 2^181931720448 is an apocalyptic number.

It is an amenable number.

181931720448 is an abundant number, since it is smaller than the sum of its proper divisors (302338711680).

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

181931720448 is a wasteful number, since it uses less digits than its factorization.

181931720448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32669 (or 32655 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 48.

The spelling of 181931720448 in words is "one hundred eighty-one billion, nine hundred thirty-one million, seven hundred twenty thousand, four hundred forty-eight".