645429686 has 16 divisors (see below), whose sum is σ = 1056548880. Its totient is φ = 293268480.

The previous prime is 645429649. The next prime is 645429727. The reversal of 645429686 is 686924546.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 107270 + ... + 113126.

It is an arithmetic number, because the mean of its divisors is an integer number (66034305).

Almost surely, 2^645429686 is an apocalyptic number.

645429686 is a deficient number, since it is larger than the sum of its proper divisors (411119194).

645429686 is a wasteful number, since it uses less digits than its factorization.

645429686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10879.

The product of its digits is 2488320, while the sum is 50.

The square root of 645429686 is about 25405.3082248573. The cubic root of 645429686 is about 864.2040796997.

The spelling of 645429686 in words is "six hundred forty-five million, four hundred twenty-nine thousand, six hundred eighty-six".