66788140 has 12 divisors (see below), whose sum is σ = 140255136. Its totient is φ = 26715248.

The previous prime is 66788093. The next prime is 66788171. The reversal of 66788140 is 4188766.

It is a junction number, because it is equal to n+sod(n) for n = 66788093 and 66788102.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1669684 + ... + 1669723.

It is an arithmetic number, because the mean of its divisors is an integer number (11687928).

Almost surely, 2^66788140 is an apocalyptic number.

It is an amenable number.

66788140 is an abundant number, since it is smaller than the sum of its proper divisors (73466996).

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

66788140 is a wasteful number, since it uses less digits than its factorization.

66788140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3339416 (or 3339414 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 66788140 is about 8172.4011159512. The cubic root of 66788140 is about 405.7262587270.

The spelling of 66788140 in words is "sixty-six million, seven hundred eighty-eight thousand, one hundred forty".