66439396 has 24 divisors (see below), whose sum is σ = 117746496. Its totient is φ = 32800800.

The previous prime is 66439391. The next prime is 66439397. The reversal of 66439396 is 69393466.

It is not an unprimeable number, because it can be changed into a prime (66439391) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 191295 + ... + 191641.

It is an arithmetic number, because the mean of its divisors is an integer number (4906104).

Almost surely, 2^66439396 is an apocalyptic number.

It is an amenable number.

66439396 is a deficient number, since it is larger than the sum of its proper divisors (51307100).

66439396 is a wasteful number, since it uses less digits than its factorization.

66439396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 819 (or 817 counting only the distinct ones).

The product of its digits is 629856, while the sum is 46.

The square root of 66439396 is about 8151.0364985074. The cubic root of 66439396 is about 405.0188397475.

The spelling of 66439396 in words is "sixty-six million, four hundred thirty-nine thousand, three hundred ninety-six".