645163040 has 24 divisors (see below), whose sum is σ = 1524198060. Its totient is φ = 258065152.

The previous prime is 645163037. The next prime is 645163061. The reversal of 645163040 is 40361546.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 625200016 + 19963024 = 25004^2 + 4468^2 .

It is a junction number, because it is equal to n+sod(n) for n = 645162994 and 645163012.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2015975 + ... + 2016294.

Almost surely, 2^645163040 is an apocalyptic number.

It is an amenable number.

645163040 is an abundant number, since it is smaller than the sum of its proper divisors (879035020).

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

645163040 is a wasteful number, since it uses less digits than its factorization.

645163040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4032284 (or 4032276 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 645163040 is about 25400.0598424492. The cubic root of 645163040 is about 864.0850539268.

The spelling of 645163040 in words is "six hundred forty-five million, one hundred sixty-three thousand, forty".