66768744 has 32 divisors (see below), whose sum is σ = 190768320. Its totient is φ = 19076736.

The previous prime is 66768739. The next prime is 66768763. The reversal of 66768744 is 44786766.

It is a happy number.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 66768693 and 66768702.

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, 198549 + ... + 198884.

It is an arithmetic number, because the mean of its divisors is an integer number (5961510).

Almost surely, 2^66768744 is an apocalyptic number.

It is an amenable number.

66768744 is an abundant number, since it is smaller than the sum of its proper divisors (123999576).

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

66768744 is a wasteful number, since it uses less digits than its factorization.

66768744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397449 (or 397445 counting only the distinct ones).

The product of its digits is 1354752, while the sum is 48.

The square root of 66768744 is about 8171.2143528364. The cubic root of 66768744 is about 405.6869791561.

The spelling of 66768744 in words is "sixty-six million, seven hundred sixty-eight thousand, seven hundred forty-four".