646432071 has 4 divisors (see below), whose sum is σ = 861909432. Its totient is φ = 430954712.

The previous prime is 646431991. The next prime is 646432081. The reversal of 646432071 is 170234646.

It is a happy number.

646432071 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 646432071 - 2¹¹ = 646430023 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646432081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107738676 + ... + 107738681.

It is an arithmetic number, because the mean of its divisors is an integer number (215477358).

Almost surely, 2^646432071 is an apocalyptic number.

646432071 is a deficient number, since it is larger than the sum of its proper divisors (215477361).

646432071 is a wasteful number, since it uses less digits than its factorization.

646432071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215477360.

The product of its (nonzero) digits is 24192, while the sum is 33.

The square root of 646432071 is about 25425.0284365623. The cubic root of 646432071 is about 864.6512325347.

The spelling of 646432071 in words is "six hundred forty-six million, four hundred thirty-two thousand, seventy-one".