66682920 has 32 divisors (see below), whose sum is σ = 200049120. Its totient is φ = 17782080.

The previous prime is 66682909. The next prime is 66682937. The reversal of 66682920 is 2928666.

It is a super-2 number, since 2×66682920² = 8893223639452800, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 277726 + ... + 277965.

It is an arithmetic number, because the mean of its divisors is an integer number (6251535).

Almost surely, 2^66682920 is an apocalyptic number.

66682920 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66682920 is an abundant number, since it is smaller than the sum of its proper divisors (133366200).

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

66682920 is a wasteful number, since it uses less digits than its factorization.

66682920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 555705 (or 555701 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 39.

The square root of 66682920 is about 8165.9610579527. The cubic root of 66682920 is about 405.5130823795.

The spelling of 66682920 in words is "sixty-six million, six hundred eighty-two thousand, nine hundred twenty".