664677 has 36 divisors (see below), whose sum is σ = 1141920. Its totient is φ = 370656.

The previous prime is 664669. The next prime is 664679. The reversal of 664677 is 776466.

664677 is a `hidden beast` number, since 6 + 646 + 7 + 7 = 666.

It is not a de Polignac number, because 664677 - 2³ = 664669 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664679) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 28888 + ... + 28910.

It is an arithmetic number, because the mean of its divisors is an integer number (31720).

2⁶⁶⁴⁶⁷⁷ is an apocalyptic number.

It is an amenable number.

664677 is a deficient number, since it is larger than the sum of its proper divisors (477243).

664677 is a wasteful number, since it uses less digits than its factorization.

664677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74 (or 58 counting only the distinct ones).

The product of its digits is 42336, while the sum is 36.

The square root of 664677 is about 815.2772534543. The cubic root of 664677 is about 87.2710531757.

The spelling of 664677 in words is "six hundred sixty-four thousand, six hundred seventy-seven".