68531784 has 64 divisors (see below), whose sum is σ = 181828800. Its totient is φ = 21464064.

The previous prime is 68531779. The next prime is 68531857. The reversal of 68531784 is 48713586.

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, 61924 + ... + 63020.

It is an arithmetic number, because the mean of its divisors is an integer number (2841075).

Almost surely, 2^68531784 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 68531784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90914400).

68531784 is an abundant number, since it is smaller than the sum of its proper divisors (113297016).

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

68531784 is a wasteful number, since it uses less digits than its factorization.

68531784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1262 (or 1258 counting only the distinct ones).

The product of its digits is 161280, while the sum is 42.

The square root of 68531784 is about 8278.3925976001. The cubic root of 68531784 is about 409.2267480119.

The spelling of 68531784 in words is "sixty-eight million, five hundred thirty-one thousand, seven hundred eighty-four".