66809236 has 12 divisors (see below), whose sum is σ = 125909812. Its totient is φ = 30835008.

The previous prime is 66809221. The next prime is 66809257. The reversal of 66809236 is 63290866.

It can be written as a sum of positive squares in 2 ways, for example, as 15256836 + 51552400 = 3906^2 + 7180^2 .

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

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 3 ways as a sum of consecutive naturals, for example, 642345 + ... + 642448.

Almost surely, 2^66809236 is an apocalyptic number.

It is an amenable number.

66809236 is a deficient number, since it is larger than the sum of its proper divisors (59100576).

66809236 is a wasteful number, since it uses less digits than its factorization.

66809236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1284810 (or 1284808 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 40.

The square root of 66809236 is about 8173.6916995933. The cubic root of 66809236 is about 405.7689723990.

The spelling of 66809236 in words is "sixty-six million, eight hundred nine thousand, two hundred thirty-six".