645411608 has 16 divisors (see below), whose sum is σ = 1273839000. Its totient is φ = 305721216.

The previous prime is 645411601. The next prime is 645411623. The reversal of 645411608 is 806114546.

It is a super-2 number, since 2×645411608² = 833112287482291328, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645411601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2122913 + ... + 2123216.

Almost surely, 2^645411608 is an apocalyptic number.

It is an amenable number.

645411608 is a deficient number, since it is larger than the sum of its proper divisors (628427392).

645411608 is a wasteful number, since it uses less digits than its factorization.

645411608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4246154 (or 4246150 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 645411608 is about 25404.9524305794. The cubic root of 645411608 is about 864.1960110556.

The spelling of 645411608 in words is "six hundred forty-five million, four hundred eleven thousand, six hundred eight".