645632207 has 8 divisors (see below), whose sum is σ = 721505232. Its totient is φ = 572622400.

The previous prime is 645632177. The next prime is 645632209. The reversal of 645632207 is 702236546.

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

It is not a de Polignac number, because 645632207 - 2¹² = 645628111 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 (645632209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 715328 + ... + 716229.

It is an arithmetic number, because the mean of its divisors is an integer number (90188154).

Almost surely, 2^645632207 is an apocalyptic number.

645632207 is a deficient number, since it is larger than the sum of its proper divisors (75873025).

645632207 is a wasteful number, since it uses less digits than its factorization.

645632207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1431609.

The product of its (nonzero) digits is 60480, while the sum is 35.

The square root of 645632207 is about 25409.2937131279. The cubic root of 645632207 is about 864.2944593727.

The spelling of 645632207 in words is "six hundred forty-five million, six hundred thirty-two thousand, two hundred seven".