645632206 has 8 divisors (see below), whose sum is σ = 969071040. Its totient is φ = 322608528.

The previous prime is 645632177. The next prime is 645632209. The reversal of 645632206 is 602236546.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645632209) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99871 + ... + 106138.

It is an arithmetic number, because the mean of its divisors is an integer number (121133880).

Almost surely, 2^645632206 is an apocalyptic number.

645632206 is a deficient number, since it is larger than the sum of its proper divisors (323438834).

645632206 is a wasteful number, since it uses less digits than its factorization.

645632206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207578.

The product of its (nonzero) digits is 51840, while the sum is 34.

The square root of 645632206 is about 25409.2936934500. The cubic root of 645632206 is about 864.2944589265.

The spelling of 645632206 in words is "six hundred forty-five million, six hundred thirty-two thousand, two hundred six".