646144056 has 24 divisors (see below), whose sum is σ = 1749973680. Its totient is φ = 215381328.

The previous prime is 646144033. The next prime is 646144087. The reversal of 646144056 is 650441646.

646144056 is a `hidden beast` number, since 646 + 1 + 4 + 4 + 0 + 5 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×646144056² = 835004282208262272, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 646144056.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 4487040 + ... + 4487183.

It is an arithmetic number, because the mean of its divisors is an integer number (72915570).

Almost surely, 2^646144056 is an apocalyptic number.

It is an amenable number.

646144056 is an abundant number, since it is smaller than the sum of its proper divisors (1103829624).

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

646144056 is a wasteful number, since it uses less digits than its factorization.

646144056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8974235 (or 8974228 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The square root of 646144056 is about 25419.3638000639. The cubic root of 646144056 is about 864.5227995922.

The spelling of 646144056 in words is "six hundred forty-six million, one hundred forty-four thousand, fifty-six".