645422450 has 48 divisors (see below), whose sum is σ = 1237394760. Its totient is φ = 250283520.

The previous prime is 645422431. The next prime is 645422467. The reversal of 645422450 is 54224546.

645422450 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 12 ways, for example, as 122522761 + 522899689 = 11069^2 + 22867^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 756224 + ... + 757076.

Almost surely, 2^645422450 is an apocalyptic number.

645422450 is a deficient number, since it is larger than the sum of its proper divisors (591972310).

645422450 is a wasteful number, since it uses less digits than its factorization.

645422450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1311 (or 1306 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 32.

The square root of 645422450 is about 25405.1658132751. The cubic root of 645422450 is about 864.2008501178.

Adding to 645422450 its reverse (54224546), we get a palindrome (699646996).

The spelling of 645422450 in words is "six hundred forty-five million, four hundred twenty-two thousand, four hundred fifty".