646133288 has 8 divisors (see below), whose sum is σ = 1211499930. Its totient is φ = 323066640.

The previous prime is 646133287. The next prime is 646133321. The reversal of 646133288 is 882331646.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 646074724 + 58564 = 25418^2 + 242^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (646133281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40383323 + ... + 40383338.

Almost surely, 2^646133288 is an apocalyptic number.

It is an amenable number.

646133288 is a deficient number, since it is larger than the sum of its proper divisors (565366642).

646133288 is a wasteful number, since it uses less digits than its factorization.

646133288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80766667 (or 80766663 counting only the distinct ones).

The product of its digits is 165888, while the sum is 41.

The square root of 646133288 is about 25419.1519921495. The cubic root of 646133288 is about 864.5179971372.

The spelling of 646133288 in words is "six hundred forty-six million, one hundred thirty-three thousand, two hundred eighty-eight".