66788144 has 10 divisors (see below), whose sum is σ = 129402060. Its totient is φ = 33394064.

The previous prime is 66788093. The next prime is 66788171. The reversal of 66788144 is 44188766.

It is a junction number, because it is equal to n+sod(n) for n = 66788095 and 66788104.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2087114 + ... + 2087145.

It is an arithmetic number, because the mean of its divisors is an integer number (12940206).

Almost surely, 2^66788144 is an apocalyptic number.

It is an amenable number.

66788144 is a deficient number, since it is larger than the sum of its proper divisors (62613916).

66788144 is a wasteful number, since it uses less digits than its factorization.

66788144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4174267 (or 4174261 counting only the distinct ones).

The product of its digits is 258048, while the sum is 44.

The square root of 66788144 is about 8172.4013606773. The cubic root of 66788144 is about 405.7262668267.

The spelling of 66788144 in words is "sixty-six million, seven hundred eighty-eight thousand, one hundred forty-four".