645462213 has 8 divisors (see below), whose sum is σ = 938854176. Its totient is φ = 391189200.

The previous prime is 645462173. The next prime is 645462229. The reversal of 645462213 is 312264546.

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

It is not a de Polignac number, because 645462213 - 2⁶ = 645462149 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 19559461 = 645462213 / (6 + 4 + 5 + 4 + 6 + 2 + 2 + 1 + 3).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645464213) 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, 9779698 + ... + 9779763.

It is an arithmetic number, because the mean of its divisors is an integer number (117356772).

Almost surely, 2^645462213 is an apocalyptic number.

It is an amenable number.

645462213 is a deficient number, since it is larger than the sum of its proper divisors (293391963).

645462213 is a wasteful number, since it uses less digits than its factorization.

645462213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19559475.

The product of its digits is 34560, while the sum is 33.

The square root of 645462213 is about 25405.9483782834. The cubic root of 645462213 is about 864.2185968989.

The spelling of 645462213 in words is "six hundred forty-five million, four hundred sixty-two thousand, two hundred thirteen".