667788812 has 24 divisors (see below), whose sum is σ = 1198320480. Its totient is φ = 325427840.

The previous prime is 667788811. The next prime is 667788833. The reversal of 667788812 is 218887766.

It is a happy number.

667788812 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (667788811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 326489 + ... + 328527.

It is an arithmetic number, because the mean of its divisors is an integer number (49930020).

Almost surely, 2^667788812 is an apocalyptic number.

It is an amenable number.

667788812 is a deficient number, since it is larger than the sum of its proper divisors (530531668).

667788812 is a wasteful number, since it uses less digits than its factorization.

667788812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4081 (or 4079 counting only the distinct ones).

The product of its digits is 1806336, while the sum is 53.

The square root of 667788812 is about 25841.6100891566. The cubic root of 667788812 is about 874.0703321087.

The spelling of 667788812 in words is "six hundred sixty-seven million, seven hundred eighty-eight thousand, eight hundred twelve".