181672640 has 112 divisors (see below), whose sum is σ = 452408544. Its totient is φ = 69427200.

The previous prime is 181672633. The next prime is 181672651. The reversal of 181672640 is 46276181.

It is a self number, because there is not a number n which added to its sum of digits gives 181672640.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 800207 + ... + 800433.

It is an arithmetic number, because the mean of its divisors is an integer number (4039362).

Almost surely, 2^181672640 is an apocalyptic number.

181672640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 181672640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (226204272).

181672640 is an abundant number, since it is smaller than the sum of its proper divisors (270735904).

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

181672640 is a wasteful number, since it uses less digits than its factorization.

181672640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346 (or 336 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 181672640 is about 13478.5993337587. The cubic root of 181672640 is about 566.3651329255.

The spelling of 181672640 in words is "one hundred eighty-one million, six hundred seventy-two thousand, six hundred forty".