642553256 has 32 divisors (see below), whose sum is σ = 1226788200. Its totient is φ = 315463680.

The previous prime is 642553207. The next prime is 642553259. The reversal of 642553256 is 652355246.

It can be written as a sum of positive squares in 4 ways, for example, as 562164100 + 80389156 = 23710^2 + 8966^2 .

It is not an unprimeable number, because it can be changed into a prime (642553259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95276 + ... + 101796.

Almost surely, 2^642553256 is an apocalyptic number.

It is an amenable number.

642553256 is a deficient number, since it is larger than the sum of its proper divisors (584234944).

642553256 is a wasteful number, since it uses less digits than its factorization.

642553256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6749 (or 6745 counting only the distinct ones).

The product of its digits is 216000, while the sum is 38.

The square root of 642553256 is about 25348.6342038383. The cubic root of 642553256 is about 862.9183602543.

The spelling of 642553256 in words is "six hundred forty-two million, five hundred fifty-three thousand, two hundred fifty-six".