645436606 has 8 divisors (see below), whose sum is σ = 975778560. Its totient is φ = 320177088.

The previous prime is 645436601. The next prime is 645436613. The reversal of 645436606 is 606634546.

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 (645436601) 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, 1270291 + ... + 1270798.

It is an arithmetic number, because the mean of its divisors is an integer number (121972320).

Almost surely, 2^645436606 is an apocalyptic number.

645436606 is a deficient number, since it is larger than the sum of its proper divisors (330341954).

645436606 is a wasteful number, since it uses less digits than its factorization.

645436606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2541218.

The product of its (nonzero) digits is 311040, while the sum is 40.

The square root of 645436606 is about 25405.4444165025. Note that the first 4 decimals coincide. The cubic root of 645436606 is about 864.2071682214.

The spelling of 645436606 in words is "six hundred forty-five million, four hundred thirty-six thousand, six hundred six".