2578648069 has 4 divisors (see below), whose sum is σ = 2604179340. Its totient is φ = 2553116800.

The previous prime is 2578648049. The next prime is 2578648073. The reversal of 2578648069 is 9608468752.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1345935969 + 1232712100 = 36687^2 + 35110^2 .

It is a cyclic number.

It is not a de Polignac number, because 2578648069 - 2⁹ = 2578647557 is a prime.

It is a super-2 number, since 2×2578648069² = 13298851727514857522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2578648019) 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, 12765484 + ... + 12765685.

It is an arithmetic number, because the mean of its divisors is an integer number (651044835).

Almost surely, 2^2578648069 is an apocalyptic number.

It is an amenable number.

2578648069 is a deficient number, since it is larger than the sum of its proper divisors (25531271).

2578648069 is a wasteful number, since it uses less digits than its factorization.

2578648069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25531270.

The product of its (nonzero) digits is 5806080, while the sum is 55.

The square root of 2578648069 is about 50780.3905951894. The cubic root of 2578648069 is about 1371.2943650020.

The spelling of 2578648069 in words is "two billion, five hundred seventy-eight million, six hundred forty-eight thousand, sixty-nine".