667747 has 8 divisors (see below), whose sum is σ = 698544. Its totient is φ = 637728.

The previous prime is 667741. The next prime is 667753. The reversal of 667747 is 747766.

It is an interprime number because it is at equal distance from previous prime (667741) and next prime (667753).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 667747 - 2¹⁵ = 634979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (667741) 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, 2133 + ... + 2425.

It is an arithmetic number, because the mean of its divisors is an integer number (87318).

2⁶⁶⁷⁷⁴⁷ is an apocalyptic number.

667747 is a deficient number, since it is larger than the sum of its proper divisors (30797).

667747 is a wasteful number, since it uses less digits than its factorization.

667747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389.

The product of its digits is 49392, while the sum is 37.

The square root of 667747 is about 817.1578794823. The cubic root of 667747 is about 87.4052089120.

It can be divided in two parts, 6677 and 47, that added together give a square (6724 = 82²).

The spelling of 667747 in words is "six hundred sixty-seven thousand, seven hundred forty-seven".