66786434 has 72 divisors (see below), whose sum is σ = 126173376. Its totient is φ = 26426400.

The previous prime is 66786403. The next prime is 66786451. The reversal of 66786434 is 43468766.

It is a happy number.

66786434 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Its product of digits (580608) is a multiple of the sum of its prime factors (144).

It is an unprimeable number.

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 35 ways as a sum of consecutive naturals, for example, 940619 + ... + 940689.

It is an arithmetic number, because the mean of its divisors is an integer number (1752408).

Almost surely, 2^66786434 is an apocalyptic number.

66786434 is a deficient number, since it is larger than the sum of its proper divisors (59386942).

66786434 is a wasteful number, since it uses less digits than its factorization.

66786434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144 (or 120 counting only the distinct ones).

The product of its digits is 580608, while the sum is 44.

The square root of 66786434 is about 8172.2967395953. The cubic root of 66786434 is about 405.7228041471.

The spelling of 66786434 in words is "sixty-six million, seven hundred eighty-six thousand, four hundred thirty-four".