2578913649 has 12 divisors (see below), whose sum is σ = 4011643636. Its totient is φ = 1587023712.

The previous prime is 2578913647. The next prime is 2578913657. The reversal of 2578913649 is 9463198752.

2578913649 is a `hidden beast` number, since 2 + 578 + 9 + 1 + 3 + 64 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 128663649 + 2450250000 = 11343^2 + 49500^2 .

It is not a de Polignac number, because 2578913649 - 2¹ = 2578913647 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2578913595 and 2578913604.

It is not an unprimeable number, because it can be changed into a prime (2578913647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11020882 + ... + 11021115.

Almost surely, 2^2578913649 is an apocalyptic number.

It is an amenable number.

2578913649 is a deficient number, since it is larger than the sum of its proper divisors (1432729987).

2578913649 is a wasteful number, since it uses less digits than its factorization.

2578913649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22042016 (or 22042013 counting only the distinct ones).

The product of its digits is 3265920, while the sum is 54.

The square root of 2578913649 is about 50783.0055136558. The cubic root of 2578913649 is about 1371.3414408140.

The spelling of 2578913649 in words is "two billion, five hundred seventy-eight million, nine hundred thirteen thousand, six hundred forty-nine".