645294606 has 64 divisors (see below), whose sum is σ = 1495929600. Its totient is φ = 183513600.

The previous prime is 645294599. The next prime is 645294607. The reversal of 645294606 is 606492546.

645294606 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645294607) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 134326 + ... + 139046.

It is an arithmetic number, because the mean of its divisors is an integer number (23373900).

Almost surely, 2^645294606 is an apocalyptic number.

645294606 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 645294606, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (747964800).

645294606 is an abundant number, since it is smaller than the sum of its proper divisors (850634994).

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

645294606 is a wasteful number, since it uses less digits than its factorization.

645294606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4865.

The product of its (nonzero) digits is 311040, while the sum is 42.

The square root of 645294606 is about 25402.6495862144. The cubic root of 645294606 is about 864.1437866193.

The spelling of 645294606 in words is "six hundred forty-five million, two hundred ninety-four thousand, six hundred six".