2578326509 has 8 divisors (see below), whose sum is σ = 2820068352. Its totient is φ = 2337809440.

The previous prime is 2578326481. The next prime is 2578326521. The reversal of 2578326509 is 9056238752.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2578326509 - 2²⁸ = 2309891053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2578326109) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 301784 + ... + 310209.

It is an arithmetic number, because the mean of its divisors is an integer number (352508544).

Almost surely, 2^2578326509 is an apocalyptic number.

It is an amenable number.

2578326509 is a deficient number, since it is larger than the sum of its proper divisors (241741843).

2578326509 is a wasteful number, since it uses less digits than its factorization.

2578326509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 612387.

The product of its (nonzero) digits is 907200, while the sum is 47.

The square root of 2578326509 is about 50777.2243136625. The cubic root of 2578326509 is about 1371.2373620383.

The spelling of 2578326509 in words is "two billion, five hundred seventy-eight million, three hundred twenty-six thousand, five hundred nine".