66787144 has 32 divisors (see below), whose sum is σ = 131120640. Its totient is φ = 31852800.

The previous prime is 66787129. The next prime is 66787177. The reversal of 66787144 is 44178766.

It is a self number, because there is not a number n which added to its sum of digits gives 66787144.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15712 + ... + 19504.

It is an arithmetic number, because the mean of its divisors is an integer number (4097520).

Almost surely, 2^66787144 is an apocalyptic number.

It is an amenable number.

66787144 is a deficient number, since it is larger than the sum of its proper divisors (64333496).

66787144 is a wasteful number, since it uses less digits than its factorization.

66787144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3901 (or 3897 counting only the distinct ones).

The product of its digits is 225792, while the sum is 43.

The square root of 66787144 is about 8172.3401789206. The cubic root of 66787144 is about 405.7242418751.

The spelling of 66787144 in words is "sixty-six million, seven hundred eighty-seven thousand, one hundred forty-four".