645270 has 32 divisors (see below), whose sum is σ = 1569888. Its totient is φ = 169728.

The previous prime is 645257. The next prime is 645313. The reversal of 645270 is 72546.

It is a happy number.

645270 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 645270.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4032 + ... + 4188.

It is an arithmetic number, because the mean of its divisors is an integer number (49059).

2⁶⁴⁵²⁷⁰ is an apocalyptic number.

645270 is an abundant number, since it is smaller than the sum of its proper divisors (924618).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645270 is a wasteful number, since it uses less digits than its factorization.

645270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304.

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 645270 is about 803.2869972805. The cubic root of 645270 is about 86.4132802803.

The spelling of 645270 in words is "six hundred forty-five thousand, two hundred seventy".