646611560 has 32 divisors (see below), whose sum is σ = 1662716160. Its totient is φ = 221695296.

The previous prime is 646611557. The next prime is 646611569. The reversal of 646611560 is 65116646.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 646611560.

It is not an unprimeable number, because it can be changed into a prime (646611569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1154384 + ... + 1154943.

It is an arithmetic number, because the mean of its divisors is an integer number (51959880).

Almost surely, 2^646611560 is an apocalyptic number.

It is an amenable number.

646611560 is an abundant number, since it is smaller than the sum of its proper divisors (1016104600).

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

646611560 is a wasteful number, since it uses less digits than its factorization.

646611560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2309345 (or 2309341 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 646611560 is about 25428.5579614732. The cubic root of 646611560 is about 864.7312517821.

The spelling of 646611560 in words is "six hundred forty-six million, six hundred eleven thousand, five hundred sixty".