645738134 has 24 divisors (see below), whose sum is σ = 1001761488. Its totient is φ = 312167520.

The previous prime is 645738103. The next prime is 645738139. The reversal of 645738134 is 431837546.

It is a junction number, because it is equal to n+sod(n) for n = 645738091 and 645738100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645738139) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 494927 + ... + 496229.

It is an arithmetic number, because the mean of its divisors is an integer number (41740062).

Almost surely, 2^645738134 is an apocalyptic number.

645738134 is a deficient number, since it is larger than the sum of its proper divisors (356023354).

645738134 is a wasteful number, since it uses less digits than its factorization.

645738134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1560 (or 1523 counting only the distinct ones).

The product of its digits is 241920, while the sum is 41.

The square root of 645738134 is about 25411.3780421291. The cubic root of 645738134 is about 864.3417242147.

The spelling of 645738134 in words is "six hundred forty-five million, seven hundred thirty-eight thousand, one hundred thirty-four".