66826860 has 24 divisors (see below), whose sum is σ = 187115376. Its totient is φ = 17820480.

The previous prime is 66826849. The next prime is 66826871. The reversal of 66826860 is 6862866.

It is an interprime number because it is at equal distance from previous prime (66826849) and next prime (66826871).

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, 556831 + ... + 556950.

It is an arithmetic number, because the mean of its divisors is an integer number (7796474).

Almost surely, 2^66826860 is an apocalyptic number.

66826860 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66826860 is an abundant number, since it is smaller than the sum of its proper divisors (120288516).

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

66826860 is a wasteful number, since it uses less digits than its factorization.

66826860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1113793 (or 1113791 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 42.

The square root of 66826860 is about 8174.7697215273. The cubic root of 66826860 is about 405.8046493207.

The spelling of 66826860 in words is "sixty-six million, eight hundred twenty-six thousand, eight hundred sixty".