646274 has 4 divisors (see below), whose sum is σ = 969414. Its totient is φ = 323136.

The previous prime is 646273. The next prime is 646291. The reversal of 646274 is 472646.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 472646 = 2 ⋅236323.

It can be written as a sum of positive squares in only one way, i.e., 403225 + 243049 = 635^2 + 493^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (646271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161567 + ... + 161570.

2⁶⁴⁶²⁷⁴ is an apocalyptic number.

646274 is a deficient number, since it is larger than the sum of its proper divisors (323140).

646274 is a wasteful number, since it uses less digits than its factorization.

646274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323139.

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

The square root of 646274 is about 803.9116866920. The cubic root of 646274 is about 86.4580749529.

The spelling of 646274 in words is "six hundred forty-six thousand, two hundred seventy-four".