645552294 has 16 divisors (see below), whose sum is σ = 1303640832. Its totient is φ = 213094728.

The previous prime is 645552269. The next prime is 645552301. The reversal of 645552294 is 492255546.

645552294 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 521674 + ... + 522909.

It is an arithmetic number, because the mean of its divisors is an integer number (81477552).

Almost surely, 2^645552294 is an apocalyptic number.

645552294 is an abundant number, since it is smaller than the sum of its proper divisors (658088538).

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

645552294 is a wasteful number, since it uses less digits than its factorization.

645552294 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1044691.

The product of its digits is 432000, while the sum is 42.

The square root of 645552294 is about 25407.7211492885. The cubic root of 645552294 is about 864.2587986089.

The spelling of 645552294 in words is "six hundred forty-five million, five hundred fifty-two thousand, two hundred ninety-four".