66307838 has 4 divisors (see below), whose sum is σ = 99461760. Its totient is φ = 33153918.

The previous prime is 66307819. The next prime is 66307847. The reversal of 66307838 is 83870366.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83870366 = 2 ⋅41935183.

It is a junction number, because it is equal to n+sod(n) for n = 66307795 and 66307804.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16576958 + ... + 16576961.

It is an arithmetic number, because the mean of its divisors is an integer number (24865440).

Almost surely, 2^66307838 is an apocalyptic number.

66307838 is a deficient number, since it is larger than the sum of its proper divisors (33153922).

66307838 is a wasteful number, since it uses less digits than its factorization.

66307838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33153921.

The product of its (nonzero) digits is 145152, while the sum is 41.

The square root of 66307838 is about 8142.9624830279. The cubic root of 66307838 is about 404.7513344234.

The spelling of 66307838 in words is "sixty-six million, three hundred seven thousand, eight hundred thirty-eight".