66903690 has 32 divisors (see below), whose sum is σ = 183507840. Its totient is φ = 15292224.

The previous prime is 66903689. The next prime is 66903691. The reversal of 66903690 is 9630966.

It is an interprime number because it is at equal distance from previous prime (66903689) and next prime (66903691).

It is a super-2 number, since 2×66903690² = 8952207471232200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66903691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 159085 + ... + 159504.

It is an arithmetic number, because the mean of its divisors is an integer number (5734620).

Almost surely, 2^66903690 is an apocalyptic number.

66903690 is an abundant number, since it is smaller than the sum of its proper divisors (116604150).

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

66903690 is a wasteful number, since it uses less digits than its factorization.

66903690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318606.

The product of its (nonzero) digits is 52488, while the sum is 39.

The square root of 66903690 is about 8179.4675865853. The cubic root of 66903690 is about 405.9601059266.

The spelling of 66903690 in words is "sixty-six million, nine hundred three thousand, six hundred ninety".