66939392 has 80 divisors (see below), whose sum is σ = 146943720. Its totient is φ = 30277632.

The previous prime is 66939311. The next prime is 66939403. The reversal of 66939392 is 29393966.

66939392 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 14868736 + 52070656 = 3856^2 + 7216^2 .

It is a zygodrome in base 4.

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 7 ways as a sum of consecutive naturals, for example, 592328 + ... + 592440.

Almost surely, 2^66939392 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 66939392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73471860).

66939392 is an abundant number, since it is smaller than the sum of its proper divisors (80004328).

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

66939392 is a wasteful number, since it uses less digits than its factorization.

66939392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233 (or 217 counting only the distinct ones).

The product of its digits is 472392, while the sum is 47.

The square root of 66939392 is about 8181.6497113968. The cubic root of 66939392 is about 406.0323042881.

The spelling of 66939392 in words is "sixty-six million, nine hundred thirty-nine thousand, three hundred ninety-two".