66826830 has 64 divisors (see below), whose sum is σ = 194088960. Its totient is φ = 14375424.

The previous prime is 66826789. The next prime is 66826841. The reversal of 66826830 is 3862866.

It is a Curzon 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 31 ways as a sum of consecutive naturals, for example, 5790 + ... + 12929.

It is an arithmetic number, because the mean of its divisors is an integer number (3032640).

Almost surely, 2^66826830 is an apocalyptic number.

66826830 is an abundant number, since it is smaller than the sum of its proper divisors (127262130).

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

66826830 is a wasteful number, since it uses less digits than its factorization.

66826830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18753.

The product of its (nonzero) digits is 82944, while the sum is 39.

The square root of 66826830 is about 8174.7678866131. The cubic root of 66826830 is about 405.8045885959.

The spelling of 66826830 in words is "sixty-six million, eight hundred twenty-six thousand, eight hundred thirty".