646875560 has 16 divisors (see below), whose sum is σ = 1455470100. Its totient is φ = 258750208.

The previous prime is 646875499. The next prime is 646875583. The reversal of 646875560 is 65578646.

It can be written as a sum of positive squares in 2 ways, for example, as 580713604 + 66161956 = 24098^2 + 8134^2 .

It is a super-3 number, since 3×646875560³ (a number of 27 digits) contains 333 as substring.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 8085905 + ... + 8085984.

Almost surely, 2^646875560 is an apocalyptic number.

It is an amenable number.

646875560 is an abundant number, since it is smaller than the sum of its proper divisors (808594540).

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

646875560 is a wasteful number, since it uses less digits than its factorization.

646875560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16171900 (or 16171896 counting only the distinct ones).

The product of its (nonzero) digits is 1209600, while the sum is 47.

The square root of 646875560 is about 25433.7484457168. The cubic root of 646875560 is about 864.8489205665.

It can be divided in two parts, 6468 and 75560, that added together give a palindrome (82028).

The spelling of 646875560 in words is "six hundred forty-six million, eight hundred seventy-five thousand, five hundred sixty".