645813596 has 24 divisors (see below), whose sum is σ = 1183709184. Its totient is φ = 307715760.

The previous prime is 645813583. The next prime is 645813617. The reversal of 645813596 is 695318546.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 645813596.

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, 11981 + ... + 37883.

It is an arithmetic number, because the mean of its divisors is an integer number (49321216).

Almost surely, 2^645813596 is an apocalyptic number.

It is an amenable number.

645813596 is a deficient number, since it is larger than the sum of its proper divisors (537895588).

645813596 is a wasteful number, since it uses less digits than its factorization.

645813596 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26201 (or 26199 counting only the distinct ones).

The product of its digits is 777600, while the sum is 47.

The square root of 645813596 is about 25412.8628060673. The cubic root of 645813596 is about 864.3753923593.

The spelling of 645813596 in words is "six hundred forty-five million, eight hundred thirteen thousand, five hundred ninety-six".