646465438 has 4 divisors (see below), whose sum is σ = 969698160. Its totient is φ = 323232718.

The previous prime is 646465411. The next prime is 646465447. The reversal of 646465438 is 834564646.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161616358 + ... + 161616361.

It is an arithmetic number, because the mean of its divisors is an integer number (242424540).

Almost surely, 2^646465438 is an apocalyptic number.

646465438 is a deficient number, since it is larger than the sum of its proper divisors (323232722).

646465438 is a wasteful number, since it uses less digits than its factorization.

646465438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323232721.

The product of its digits is 1658880, while the sum is 46.

The square root of 646465438 is about 25425.6846122184. The cubic root of 646465438 is about 864.6661092313. Note that the first 3 decimals are identical.

The spelling of 646465438 in words is "six hundred forty-six million, four hundred sixty-five thousand, four hundred thirty-eight".