66820382 has 16 divisors (see below), whose sum is σ = 104805792. Its totient is φ = 31891200.

The previous prime is 66820367. The next prime is 66820393. The reversal of 66820382 is 28302866.

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, 26438 + ... + 28854.

It is an arithmetic number, because the mean of its divisors is an integer number (6550362).

Almost surely, 2^66820382 is an apocalyptic number.

66820382 is a deficient number, since it is larger than the sum of its proper divisors (37985410).

66820382 is a wasteful number, since it uses less digits than its factorization.

66820382 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3043.

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 66820382 is about 8174.3734928128. The cubic root of 66820382 is about 405.7915363924.

The spelling of 66820382 in words is "sixty-six million, eight hundred twenty thousand, three hundred eighty-two".