646216367 has 16 divisors (see below), whose sum is σ = 680279040. Its totient is φ = 613009152.

The previous prime is 646216339. The next prime is 646216381. The reversal of 646216367 is 763612646.

It is a cyclic number.

It is not a de Polignac number, because 646216367 - 2²² = 642022063 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 (646216327) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 810413 + ... + 811209.

It is an arithmetic number, because the mean of its divisors is an integer number (42517440).

Almost surely, 2^646216367 is an apocalyptic number.

646216367 is a deficient number, since it is larger than the sum of its proper divisors (34062673).

646216367 is a wasteful number, since it uses less digits than its factorization.

646216367 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1282.

The product of its digits is 217728, while the sum is 41.

The square root of 646216367 is about 25420.7861208107. The cubic root of 646216367 is about 864.5550484257. Note that the first 3 decimals are identical.

The spelling of 646216367 in words is "six hundred forty-six million, two hundred sixteen thousand, three hundred sixty-seven".