645867213 has 8 divisors (see below), whose sum is σ = 911812608. Its totient is φ = 405249984.

The previous prime is 645867161. The next prime is 645867259. The reversal of 645867213 is 312768546.

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

It is not a de Polignac number, because 645867213 - 2⁹ = 645866701 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645867713) 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, 6331981 + ... + 6332082.

It is an arithmetic number, because the mean of its divisors is an integer number (113976576).

Almost surely, 2^645867213 is an apocalyptic number.

It is an amenable number.

645867213 is a deficient number, since it is larger than the sum of its proper divisors (265945395).

645867213 is a wasteful number, since it uses less digits than its factorization.

645867213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12664083.

The product of its digits is 241920, while the sum is 42.

The square root of 645867213 is about 25413.9177027077. The cubic root of 645867213 is about 864.3993125396.

The spelling of 645867213 in words is "six hundred forty-five million, eight hundred sixty-seven thousand, two hundred thirteen".