667740747 has 16 divisors (see below), whose sum is σ = 926691840. Its totient is φ = 427164192.

The previous prime is 667740743. The next prime is 667740757. The reversal of 667740747 is 747047766.

It is not a de Polignac number, because 667740747 - 2² = 667740743 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 667740696 and 667740705.

It is not an unprimeable number, because it can be changed into a prime (667740743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9363 + ... + 37724.

It is an arithmetic number, because the mean of its divisors is an integer number (57918240).

Almost surely, 2^667740747 is an apocalyptic number.

667740747 is a deficient number, since it is larger than the sum of its proper divisors (258951093).

667740747 is a wasteful number, since it uses less digits than its factorization.

667740747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47282.

The product of its (nonzero) digits is 1382976, while the sum is 48.

The square root of 667740747 is about 25840.6800800598. The cubic root of 667740747 is about 874.0493608087.

The spelling of 667740747 in words is "six hundred sixty-seven million, seven hundred forty thousand, seven hundred forty-seven".