664574 has 4 divisors (see below), whose sum is σ = 996864. Its totient is φ = 332286.

The previous prime is 664571. The next prime is 664579. The reversal of 664574 is 475466.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 475466 = 2 ⋅237733.

It is an Ulam number.

It is a plaindrome in base 9.

It is a self number, because there is not a number n which added to its sum of digits gives 664574.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166142 + ... + 166145.

It is an arithmetic number, because the mean of its divisors is an integer number (249216).

2⁶⁶⁴⁵⁷⁴ is an apocalyptic number.

664574 is a deficient number, since it is larger than the sum of its proper divisors (332290).

664574 is a wasteful number, since it uses less digits than its factorization.

664574 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332289.

The product of its digits is 20160, while the sum is 32.

The square root of 664574 is about 815.2140823121. The cubic root of 664574 is about 87.2665450298.

The spelling of 664574 in words is "six hundred sixty-four thousand, five hundred seventy-four".