66839285 has 8 divisors (see below), whose sum is σ = 80252856. Its totient is φ = 53440960.

The previous prime is 66839281. The next prime is 66839327. The reversal of 66839285 is 58293866.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 677329 + 66161956 = 823^2 + 8134^2 .

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

It is not a de Polignac number, because 66839285 - 2² = 66839281 is a prime.

It is a super-2 number, since 2×66839285² = 8934980038622450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66839281) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 11267 + ... + 16143.

It is an arithmetic number, because the mean of its divisors is an integer number (10031607).

Almost surely, 2^66839285 is an apocalyptic number.

It is an amenable number.

66839285 is a deficient number, since it is larger than the sum of its proper divisors (13413571).

66839285 is a wasteful number, since it uses less digits than its factorization.

66839285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7623.

The product of its digits is 622080, while the sum is 47.

The square root of 66839285 is about 8175.5296464510. The cubic root of 66839285 is about 405.8297979426.

The spelling of 66839285 in words is "sixty-six million, eight hundred thirty-nine thousand, two hundred eighty-five".