66764736 has 140 divisors (see below), whose sum is σ = 202475592. Its totient is φ = 21835008.

The previous prime is 66764713. The next prime is 66764743. The reversal of 66764736 is 63746766.

It is a zygodrome in base 4.

It is a junction number, because it is equal to n+sod(n) for n = 66764691 and 66764700.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1259686 + ... + 1259738.

Almost surely, 2^66764736 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 66764736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101237796).

66764736 is an abundant number, since it is smaller than the sum of its proper divisors (135710856).

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

66764736 is an frugal number, since it uses more digits than its factorization.

66764736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92 (or 58 counting only the distinct ones).

The product of its digits is 762048, while the sum is 45.

The square root of 66764736 is about 8170.9690979712. The cubic root of 66764736 is about 405.6788614559.

The spelling of 66764736 in words is "sixty-six million, seven hundred sixty-four thousand, seven hundred thirty-six".