645366790 has 16 divisors (see below), whose sum is σ = 1188676368. Its totient is φ = 252143136.

The previous prime is 645366769. The next prime is 645366797. The reversal of 645366790 is 97663546.

It is a self number, because there is not a number n which added to its sum of digits gives 645366790.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645366797) 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 7 ways as a sum of consecutive naturals, for example, 749997 + ... + 750856.

It is an arithmetic number, because the mean of its divisors is an integer number (74292273).

Almost surely, 2^645366790 is an apocalyptic number.

645366790 is a deficient number, since it is larger than the sum of its proper divisors (543309578).

645366790 is a wasteful number, since it uses less digits than its factorization.

645366790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1500903.

The product of its (nonzero) digits is 816480, while the sum is 46.

The square root of 645366790 is about 25404.0703431556. The cubic root of 645366790 is about 864.1760070598.

The spelling of 645366790 in words is "six hundred forty-five million, three hundred sixty-six thousand, seven hundred ninety".