646041564 has 36 divisors (see below), whose sum is σ = 1866343024. Its totient is φ = 184583232.

The previous prime is 646041547. The next prime is 646041577. The reversal of 646041564 is 465140646.

646041564 is a `hidden beast` number, since 646 + 0 + 4 + 1 + 5 + 6 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1281577 + ... + 1282080.

Almost surely, 2^646041564 is an apocalyptic number.

It is an amenable number.

646041564 is an abundant number, since it is smaller than the sum of its proper divisors (1220301460).

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

646041564 is a wasteful number, since it uses less digits than its factorization.

646041564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2563674 (or 2563669 counting only the distinct ones).

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

The square root of 646041564 is about 25417.3476979798. The cubic root of 646041564 is about 864.4770866921.

The spelling of 646041564 in words is "six hundred forty-six million, forty-one thousand, five hundred sixty-four".