66339904 has 14 divisors (see below), whose sum is σ = 131643374. Its totient is φ = 33169920.

The previous prime is 66339901. The next prime is 66339929. The reversal of 66339904 is 40993366.

It can be written as a sum of positive squares in only one way, i.e., 35426304 + 30913600 = 5952^2 + 5560^2 .

It is not an unprimeable number, because it can be changed into a prime (66339901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 518217 + ... + 518344.

Almost surely, 2^66339904 is an apocalyptic number.

66339904 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

66339904 is a deficient number, since it is larger than the sum of its proper divisors (65303470).

66339904 is a wasteful number, since it uses less digits than its factorization.

66339904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1036573 (or 1036563 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 40.

The square root of 66339904 is about 8144.9311844852. The cubic root of 66339904 is about 404.8165688667.

The spelling of 66339904 in words is "sixty-six million, three hundred thirty-nine thousand, nine hundred four".