66739648 has 28 divisors (see below), whose sum is σ = 133016752. Its totient is φ = 33223680.

The previous prime is 66739639. The next prime is 66739661. The reversal of 66739648 is 84693766.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13261 + ... + 17587.

Almost surely, 2^66739648 is an apocalyptic number.

It is an amenable number.

66739648 is a deficient number, since it is larger than the sum of its proper divisors (66277104).

66739648 is a wasteful number, since it uses less digits than its factorization.

66739648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4580 (or 4570 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 49.

The square root of 66739648 is about 8169.4337625077. The cubic root of 66739648 is about 405.6280414823.

The spelling of 66739648 in words is "sixty-six million, seven hundred thirty-nine thousand, six hundred forty-eight".