66402006 has 16 divisors (see below), whose sum is σ = 144877248. Its totient is φ = 20121800.

The previous prime is 66401957. The next prime is 66402043. The reversal of 66402006 is 60020466.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 502980 + ... + 503111.

It is an arithmetic number, because the mean of its divisors is an integer number (9054828).

Almost surely, 2^66402006 is an apocalyptic number.

66402006 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

66402006 is an abundant number, since it is smaller than the sum of its proper divisors (78475242).

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

66402006 is a wasteful number, since it uses less digits than its factorization.

66402006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1006107.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 66402006 is about 8148.7426023896. The cubic root of 66402006 is about 404.9428482073.

It can be divided in two parts, 6640 and 2006, that added together give a triangular number (8646 = T₁₃₁).

The spelling of 66402006 in words is "sixty-six million, four hundred two thousand, six".