2563864 has 8 divisors (see below), whose sum is σ = 4807260. Its totient is φ = 1281928.

The previous prime is 2563859. The next prime is 2563867. The reversal of 2563864 is 4683652.

It is a happy number.

2563864 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×2563864² = 13146797220992, which contains 22 as substring.

It is a d-powerful number, because it can be written as 2¹³ + 5³ + 6⁴ + 3¹¹ + 8⁷ + 6⁷ + 4² .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2563867) 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 as a sum of consecutive naturals, namely, 160234 + ... + 160249.

2^2563864 is an apocalyptic number.

It is an amenable number.

2563864 is a deficient number, since it is larger than the sum of its proper divisors (2243396).

2563864 is a wasteful number, since it uses less digits than its factorization.

2563864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320489 (or 320485 counting only the distinct ones).

The product of its digits is 34560, while the sum is 34.

The square root of 2563864 is about 1601.2070447010. The cubic root of 2563864 is about 136.8668676666.

The spelling of 2563864 in words is "two million, five hundred sixty-three thousand, eight hundred sixty-four".