648643122 has 12 divisors (see below), whose sum is σ = 1405393470. Its totient is φ = 216214368.

The previous prime is 648643081. The next prime is 648643129. The reversal of 648643122 is 221346846.

648643122 is a `hidden beast` number, since 6 + 4 + 8 + 643 + 1 + 2 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 588596121 + 60047001 = 24261^2 + 7749^2 .

It is not an unprimeable number, because it can be changed into a prime (648643129) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18017847 + ... + 18017882.

Almost surely, 2^648643122 is an apocalyptic number.

648643122 is an abundant number, since it is smaller than the sum of its proper divisors (756750348).

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

648643122 is a wasteful number, since it uses less digits than its factorization.

648643122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36035737 (or 36035734 counting only the distinct ones).

The product of its digits is 55296, while the sum is 36.

The square root of 648643122 is about 25468.4730991082. The cubic root of 648643122 is about 865.6359260560.

Adding to 648643122 its reverse (221346846), we get a palindrome (869989968).

The spelling of 648643122 in words is "six hundred forty-eight million, six hundred forty-three thousand, one hundred twenty-two".