68181732 has 18 divisors (see below), whose sum is σ = 172348358. Its totient is φ = 22727232.

The previous prime is 68181731. The next prime is 68181739. The reversal of 68181732 is 23718186.

It can be written as a sum of positive squares in only one way, i.e., 66683556 + 1498176 = 8166^2 + 1224^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 1893937 = 68181732 / (6 + 8 + 1 + 8 + 1 + 7 + 3 + 2).

It is not an unprimeable number, because it can be changed into a prime (68181731) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 946933 + ... + 947004.

Almost surely, 2^68181732 is an apocalyptic number.

It is an amenable number.

68181732 is an abundant number, since it is smaller than the sum of its proper divisors (104166626).

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

68181732 is a wasteful number, since it uses less digits than its factorization.

68181732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1893947 (or 1893942 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 68181732 is about 8257.2230198778. The cubic root of 68181732 is about 408.5287981947.

The spelling of 68181732 in words is "sixty-eight million, one hundred eighty-one thousand, seven hundred thirty-two".