664274 has 16 divisors (see below), whose sum is σ = 1111320. Its totient is φ = 295680.

The previous prime is 664273. The next prime is 664289. The reversal of 664274 is 472466.

It can be written as a sum of positive squares in 4 ways, for example, as 354025 + 310249 = 595^2 + 557^2 .

It is a Harshad number since it is a multiple of its sum of digits (29).

It is not an unprimeable number, because it can be changed into a prime (664271) 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, 314 + ... + 1194.

2⁶⁶⁴²⁷⁴ is an apocalyptic number.

664274 is a deficient number, since it is larger than the sum of its proper divisors (447046).

664274 is a wasteful number, since it uses less digits than its factorization.

664274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 925.

The product of its digits is 8064, while the sum is 29.

The square root of 664274 is about 815.0300607953. The cubic root of 664274 is about 87.2534118528.

The spelling of 664274 in words is "six hundred sixty-four thousand, two hundred seventy-four".