646738127 has 8 divisors (see below), whose sum is σ = 771265536. Its totient is φ = 530244792.

The previous prime is 646738121. The next prime is 646738129. The reversal of 646738127 is 721837646.

646738127 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 646738127 - 2⁴ = 646738111 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 (646738121) 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, 2008343 + ... + 2008664.

It is an arithmetic number, because the mean of its divisors is an integer number (96408192).

Almost surely, 2^646738127 is an apocalyptic number.

646738127 is a deficient number, since it is larger than the sum of its proper divisors (124527409).

646738127 is a wasteful number, since it uses less digits than its factorization.

646738127 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4017037.

The product of its digits is 338688, while the sum is 44.

The square root of 646738127 is about 25431.0465179866. The cubic root of 646738127 is about 864.7876686001.

The spelling of 646738127 in words is "six hundred forty-six million, seven hundred thirty-eight thousand, one hundred twenty-seven".