645788127 has 8 divisors (see below), whose sum is σ = 861214464. Its totient is φ = 430443608.

The previous prime is 645788113. The next prime is 645788137. The reversal of 645788127 is 721887546.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 645788127 - 2⁸ = 645787871 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645788137) 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, 1258 + ... + 35960.

It is an arithmetic number, because the mean of its divisors is an integer number (107651808).

Almost surely, 2^645788127 is an apocalyptic number.

645788127 is a deficient number, since it is larger than the sum of its proper divisors (215426337).

645788127 is a wasteful number, since it uses less digits than its factorization.

645788127 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40909.

The product of its digits is 752640, while the sum is 48.

The square root of 645788127 is about 25412.3616966232. The cubic root of 645788127 is about 864.3640293972.

The spelling of 645788127 in words is "six hundred forty-five million, seven hundred eighty-eight thousand, one hundred twenty-seven".