645738135 has 16 divisors (see below), whose sum is σ = 1180778496. Its totient is φ = 295194528.

The previous prime is 645738103. The next prime is 645738139. The reversal of 645738135 is 531837546.

It is not a de Polignac number, because 645738135 - 2⁵ = 645738103 is a prime.

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 polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3074839 + ... + 3075048.

It is an arithmetic number, because the mean of its divisors is an integer number (73798656).

Almost surely, 2^645738135 is an apocalyptic number.

645738135 is a deficient number, since it is larger than the sum of its proper divisors (535040361).

645738135 is a wasteful number, since it uses less digits than its factorization.

645738135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6149902.

The product of its digits is 302400, while the sum is 42.

The square root of 645738135 is about 25411.3780618053. The cubic root of 645738135 is about 864.3417246609.

The spelling of 645738135 in words is "six hundred forty-five million, seven hundred thirty-eight thousand, one hundred thirty-five".