645904230 has 32 divisors (see below), whose sum is σ = 1559464704. Its totient is φ = 171208416.

The previous prime is 645904223. The next prime is 645904241. The reversal of 645904230 is 32409546.

It is a junction number, because it is equal to n+sod(n) for n = 645904191 and 645904200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59452 + ... + 69471.

It is an arithmetic number, because the mean of its divisors is an integer number (48733272).

Almost surely, 2^645904230 is an apocalyptic number.

645904230 is an abundant number, since it is smaller than the sum of its proper divisors (913560474).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645904230 is a wasteful number, since it uses less digits than its factorization.

645904230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129100.

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 645904230 is about 25414.6459743196. The cubic root of 645904230 is about 864.4158261807.

The spelling of 645904230 in words is "six hundred forty-five million, nine hundred four thousand, two hundred thirty".