660767 has 4 divisors (see below), whose sum is σ = 689520. Its totient is φ = 632016.

The previous prime is 660757. The next prime is 660769. The reversal of 660767 is 767066.

660767 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 767066 = 2 ⋅383533.

It is a cyclic number.

It is not a de Polignac number, because 660767 - 2¹² = 656671 is a prime.

It is a super-2 number, since 2×660767² = 873226056578, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660769) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14342 + ... + 14387.

It is an arithmetic number, because the mean of its divisors is an integer number (172380).

2⁶⁶⁰⁷⁶⁷ is an apocalyptic number.

660767 is a deficient number, since it is larger than the sum of its proper divisors (28753).

660767 is a wasteful number, since it uses less digits than its factorization.

660767 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28752.

The product of its (nonzero) digits is 10584, while the sum is 32.

The square root of 660767 is about 812.8757592646. The cubic root of 660767 is about 87.0995908893.

The spelling of 660767 in words is "six hundred sixty thousand, seven hundred sixty-seven".