2578663 has 4 divisors (see below), whose sum is σ = 2581888. Its totient is φ = 2575440.

The previous prime is 2578657. The next prime is 2578717. The reversal of 2578663 is 3668752.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2578663 - 2¹³ = 2570471 is a prime.

It is a d-powerful number, because it can be written as 2¹⁵ + 5⁹ + 7² + 8⁵ + 6⁷ + 6⁷ + 3⁴ .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2578603) by changing a digit.

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, 595 + ... + 2347.

It is an arithmetic number, because the mean of its divisors is an integer number (645472).

2^2578663 is an apocalyptic number.

2578663 is a deficient number, since it is larger than the sum of its proper divisors (3225).

2578663 is a wasteful number, since it uses less digits than its factorization.

2578663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3224.

The product of its digits is 60480, while the sum is 37.

The square root of 2578663 is about 1605.8215965667. The cubic root of 2578663 is about 137.1297011706.

The spelling of 2578663 in words is "two million, five hundred seventy-eight thousand, six hundred sixty-three".