66403930 has 8 divisors (see below), whose sum is σ = 119527092. Its totient is φ = 26561568.

The previous prime is 66403927. The next prime is 66403933. The reversal of 66403930 is 3930466.

It is an interprime number because it is at equal distance from previous prime (66403927) and next prime (66403933).

It can be written as a sum of positive squares in 2 ways, for example, as 66308449 + 95481 = 8143^2 + 309^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 66403892 and 66403901.

It is not an unprimeable number, because it can be changed into a prime (66403933) 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 3 ways as a sum of consecutive naturals, for example, 3320187 + ... + 3320206.

Almost surely, 2^66403930 is an apocalyptic number.

66403930 is a deficient number, since it is larger than the sum of its proper divisors (53123162).

66403930 is a wasteful number, since it uses less digits than its factorization.

66403930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6640400.

The product of its (nonzero) digits is 11664, while the sum is 31.

The square root of 66403930 is about 8148.8606565581. The cubic root of 66403930 is about 404.9467592463.

The spelling of 66403930 in words is "sixty-six million, four hundred three thousand, nine hundred thirty".