646768127 has 4 divisors (see below), whose sum is σ = 648431160. Its totient is φ = 645105096.

The previous prime is 646768099. The next prime is 646768147. The reversal of 646768127 is 721867646.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 646768127 - 2²² = 642573823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646768147) 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 3 ways as a sum of consecutive naturals, for example, 830933 + ... + 831710.

It is an arithmetic number, because the mean of its divisors is an integer number (162107790).

Almost surely, 2^646768127 is an apocalyptic number.

646768127 is a deficient number, since it is larger than the sum of its proper divisors (1663033).

646768127 is a wasteful number, since it uses less digits than its factorization.

646768127 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1663032.

The product of its digits is 677376, while the sum is 47.

The square root of 646768127 is about 25431.6363413761. The cubic root of 646768127 is about 864.8010399209.

The spelling of 646768127 in words is "six hundred forty-six million, seven hundred sixty-eight thousand, one hundred twenty-seven".