645122604 has 48 divisors (see below), whose sum is σ = 1736134400. Its totient is φ = 182627136.

The previous prime is 645122567. The next prime is 645122609. The reversal of 645122604 is 406221546.

645122604 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (645122609) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26074 + ... + 44385.

Almost surely, 2^645122604 is an apocalyptic number.

It is an amenable number.

645122604 is an abundant number, since it is smaller than the sum of its proper divisors (1091011796).

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

645122604 is a wasteful number, since it uses less digits than its factorization.

645122604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70582 (or 70580 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 645122604 is about 25399.2638476000. The cubic root of 645122604 is about 864.0670011913.

The spelling of 645122604 in words is "six hundred forty-five million, one hundred twenty-two thousand, six hundred four".