66781734 has 8 divisors (see below), whose sum is σ = 133563480. Its totient is φ = 22260576.

The previous prime is 66781733. The next prime is 66781739. The reversal of 66781734 is 43718766.

66781734 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

66781734 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66781733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5565139 + ... + 5565150.

It is an arithmetic number, because the mean of its divisors is an integer number (16695435).

Almost surely, 2^66781734 is an apocalyptic number.

66781734 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

66781734 is a wasteful number, since it uses less digits than its factorization.

66781734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11130294.

The product of its digits is 169344, while the sum is 42.

The square root of 66781734 is about 8172.0091776747. The cubic root of 66781734 is about 405.7132865360.

The spelling of 66781734 in words is "sixty-six million, seven hundred eighty-one thousand, seven hundred thirty-four".