66868788 has 48 divisors (see below), whose sum is σ = 178827264. Its totient is φ = 19050720.

The previous prime is 66868777. The next prime is 66868801. The reversal of 66868788 is 88786866.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35281 + ... + 37127.

It is an arithmetic number, because the mean of its divisors is an integer number (3725568).

Almost surely, 2^66868788 is an apocalyptic number.

It is an amenable number.

66868788 is an abundant number, since it is smaller than the sum of its proper divisors (111958476).

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

66868788 is a wasteful number, since it uses less digits than its factorization.

66868788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2292 (or 2290 counting only the distinct ones).

The product of its digits is 6193152, while the sum is 57.

The square root of 66868788 is about 8177.3337953149. Note that the first 3 decimals coincide. The cubic root of 66868788 is about 405.8895005327.

The spelling of 66868788 in words is "sixty-six million, eight hundred sixty-eight thousand, seven hundred eighty-eight".