645224634 has 24 divisors (see below), whose sum is σ = 1398495072. Its totient is φ = 214996680.

The previous prime is 645224623. The next prime is 645224711. The reversal of 645224634 is 436422546.

645224634 is a `hidden beast` number, since 64 + 522 + 46 + 34 = 666.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 66429 + ... + 75519.

It is an arithmetic number, because the mean of its divisors is an integer number (58270628).

Almost surely, 2^645224634 is an apocalyptic number.

645224634 is an abundant number, since it is smaller than the sum of its proper divisors (753270438).

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

645224634 is a wasteful number, since it uses less digits than its factorization.

645224634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13042 (or 13039 counting only the distinct ones).

The product of its digits is 138240, while the sum is 36.

The square root of 645224634 is about 25401.2722909700. The cubic root of 645224634 is about 864.1125512455.

The spelling of 645224634 in words is "six hundred forty-five million, two hundred twenty-four thousand, six hundred thirty-four".