645055222 has 16 divisors (see below), whose sum is σ = 1112596992. Its totient is φ = 274755240.

The previous prime is 645055219. The next prime is 645055237. The reversal of 645055222 is 222550546.

It is a happy number.

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, 139054 + ... + 143617.

It is an arithmetic number, because the mean of its divisors is an integer number (69537312).

Almost surely, 2^645055222 is an apocalyptic number.

645055222 is a deficient number, since it is larger than the sum of its proper divisors (467541770).

645055222 is a wasteful number, since it uses less digits than its factorization.

645055222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282843.

The product of its (nonzero) digits is 24000, while the sum is 31.

The square root of 645055222 is about 25397.9373571950. The cubic root of 645055222 is about 864.0369166825.

The spelling of 645055222 in words is "six hundred forty-five million, fifty-five thousand, two hundred twenty-two".