645416252 has 24 divisors (see below), whose sum is σ = 1230037200. Its totient is φ = 294535296.

The previous prime is 645416251. The next prime is 645416269. The reversal of 645416252 is 252614546.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645416251) 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, 65102 + ... + 74357.

It is an arithmetic number, because the mean of its divisors is an integer number (51251550).

Almost surely, 2^645416252 is an apocalyptic number.

It is an amenable number.

645416252 is a deficient number, since it is larger than the sum of its proper divisors (584620948).

645416252 is a wasteful number, since it uses less digits than its factorization.

645416252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139565 (or 139563 counting only the distinct ones).

The product of its digits is 57600, while the sum is 35.

The square root of 645416252 is about 25405.0438299169. The cubic root of 645416252 is about 864.1980837984.

The spelling of 645416252 in words is "six hundred forty-five million, four hundred sixteen thousand, two hundred fifty-two".