646706127 has 16 divisors (see below), whose sum is σ = 875439360. Its totient is φ = 424569600.

The previous prime is 646706117. The next prime is 646706147. The reversal of 646706127 is 721607646.

It is not a de Polignac number, because 646706127 - 2²² = 642511823 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646706107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 309727 + ... + 311807.

It is an arithmetic number, because the mean of its divisors is an integer number (54714960).

Almost surely, 2^646706127 is an apocalyptic number.

646706127 is a deficient number, since it is larger than the sum of its proper divisors (228733233).

646706127 is a wasteful number, since it uses less digits than its factorization.

646706127 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3614.

The product of its (nonzero) digits is 84672, while the sum is 39.

The square root of 646706127 is about 25430.4173579593. The cubic root of 646706127 is about 864.7734054021.

The spelling of 646706127 in words is "six hundred forty-six million, seven hundred six thousand, one hundred twenty-seven".