667545768 has 24 divisors (see below), whose sum is σ = 1807936650. Its totient is φ = 222515232.

The previous prime is 667545731. The next prime is 667545773. The reversal of 667545768 is 867545766.

667545768 is a `hidden beast` number, since 6 + 67 + 5 + 4 + 576 + 8 = 666.

667545768 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 378613764 + 288932004 = 19458^2 + 16998^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4635663 + ... + 4635806.

Almost surely, 2^667545768 is an apocalyptic number.

It is an amenable number.

667545768 is an abundant number, since it is smaller than the sum of its proper divisors (1140390882).

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

667545768 is a wasteful number, since it uses less digits than its factorization.

667545768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9271481 (or 9271474 counting only the distinct ones).

The product of its digits is 8467200, while the sum is 54.

The square root of 667545768 is about 25836.9070904394. The cubic root of 667545768 is about 873.9642789556.

The spelling of 667545768 in words is "six hundred sixty-seven million, five hundred forty-five thousand, seven hundred sixty-eight".