645032223 has 24 divisors (see below), whose sum is σ = 1018055376. Its totient is φ = 390297600.

The previous prime is 645032189. The next prime is 645032233. The reversal of 645032223 is 322230546.

It is not a de Polignac number, because 645032223 - 2¹³ = 645024031 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645032233) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 60511 + ... + 70367.

It is an arithmetic number, because the mean of its divisors is an integer number (42418974).

Almost surely, 2^645032223 is an apocalyptic number.

645032223 is a deficient number, since it is larger than the sum of its proper divisors (373023153).

645032223 is a wasteful number, since it uses less digits than its factorization.

645032223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10535 (or 10532 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 27.

The square root of 645032223 is about 25397.4845801705. The cubic root of 645032223 is about 864.0266476799.

Adding to 645032223 its reverse (322230546), we get a palindrome (967262769).

The spelling of 645032223 in words is "six hundred forty-five million, thirty-two thousand, two hundred twenty-three".