645738674 has 16 divisors (see below), whose sum is σ = 1165243200. Its totient is φ = 262179504.

The previous prime is 645738673. The next prime is 645738707. The reversal of 645738674 is 476837546.

645738674 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (645738671) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1213529 + ... + 1214060.

It is an arithmetic number, because the mean of its divisors is an integer number (72827700).

Almost surely, 2^645738674 is an apocalyptic number.

645738674 is a deficient number, since it is larger than the sum of its proper divisors (519504526).

645738674 is a wasteful number, since it uses less digits than its factorization.

645738674 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2427617.

The product of its digits is 3386880, while the sum is 50.

The square root of 645738674 is about 25411.3886672885. The cubic root of 645738674 is about 864.3419651506.

The spelling of 645738674 in words is "six hundred forty-five million, seven hundred thirty-eight thousand, six hundred seventy-four".