664774 has 24 divisors (see below), whose sum is σ = 1139544. Its totient is φ = 290400.

The previous prime is 664771. The next prime is 664777. The reversal of 664774 is 477466.

It is an interprime number because it is at equal distance from previous prime (664771) and next prime (664777).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664771) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9889 + ... + 9955.

It is an arithmetic number, because the mean of its divisors is an integer number (47481).

2⁶⁶⁴⁷⁷⁴ is an apocalyptic number.

664774 is a deficient number, since it is larger than the sum of its proper divisors (474770).

664774 is a wasteful number, since it uses less digits than its factorization.

664774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132 (or 121 counting only the distinct ones).

The product of its digits is 28224, while the sum is 34.

The square root of 664774 is about 815.3367402491. The cubic root of 664774 is about 87.2752982855.

The spelling of 664774 in words is "six hundred sixty-four thousand, seven hundred seventy-four".