645274 has 8 divisors (see below), whose sum is σ = 1106208. Its totient is φ = 276540.

The previous prime is 645257. The next prime is 645313. The reversal of 645274 is 472546.

645274 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23032 + ... + 23059.

It is an arithmetic number, because the mean of its divisors is an integer number (138276).

2⁶⁴⁵²⁷⁴ is an apocalyptic number.

645274 is a deficient number, since it is larger than the sum of its proper divisors (460934).

645274 is a wasteful number, since it uses less digits than its factorization.

645274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46100.

The product of its digits is 6720, while the sum is 28.

The square root of 645274 is about 803.2894870469. The cubic root of 645274 is about 86.4134588373.

It can be divided in two parts, 645 and 274, that added together give a palindrome (919).

The spelling of 645274 in words is "six hundred forty-five thousand, two hundred seventy-four".