645134622 has 16 divisors (see below), whose sum is σ = 1407566592. Its totient is φ = 195495320.

The previous prime is 645134617. The next prime is 645134639. The reversal of 645134622 is 226431546.

It is a Harshad number since it is a multiple of its sum of digits (33).

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, 4887318 + ... + 4887449.

It is an arithmetic number, because the mean of its divisors is an integer number (87972912).

Almost surely, 2^645134622 is an apocalyptic number.

645134622 is an abundant number, since it is smaller than the sum of its proper divisors (762431970).

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

645134622 is a wasteful number, since it uses less digits than its factorization.

645134622 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9774783.

The product of its digits is 34560, while the sum is 33.

The square root of 645134622 is about 25399.5004281580. The cubic root of 645134622 is about 864.0723667309.

The spelling of 645134622 in words is "six hundred forty-five million, one hundred thirty-four thousand, six hundred twenty-two".