645361064 has 16 divisors (see below), whose sum is σ = 1212296820. Its totient is φ = 322081920.

The previous prime is 645361063. The next prime is 645361081. The reversal of 645361064 is 460163546.

It can be written as a sum of positive squares in 2 ways, for example, as 644652100 + 708964 = 25390^2 + 842^2 .

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (645361061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70229 + ... + 78884.

Almost surely, 2^645361064 is an apocalyptic number.

It is an amenable number.

645361064 is a deficient number, since it is larger than the sum of its proper divisors (566935756).

645361064 is a wasteful number, since it uses less digits than its factorization.

645361064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149660 (or 149656 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 35.

The square root of 645361064 is about 25403.9576444301. The cubic root of 645361064 is about 864.1734512592.

The spelling of 645361064 in words is "six hundred forty-five million, three hundred sixty-one thousand, sixty-four".