2578436647 has 2 divisors, whose sum is σ = 2578436648. Its totient is φ = 2578436646.

The previous prime is 2578436617. The next prime is 2578436657. The reversal of 2578436647 is 7466348752.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2578436647 - 2⁷ = 2578436519 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2578436594 and 2578436603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2578436617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1289218323 + 1289218324.

It is an arithmetic number, because the mean of its divisors is an integer number (1289218324).

Almost surely, 2^2578436647 is an apocalyptic number.

2578436647 is a deficient number, since it is larger than the sum of its proper divisors (1).

2578436647 is an equidigital number, since it uses as much as digits as its factorization.

2578436647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6773760, while the sum is 52.

The square root of 2578436647 is about 50778.3088237487. The cubic root of 2578436647 is about 1371.2568867429.

The spelling of 2578436647 in words is "two billion, five hundred seventy-eight million, four hundred thirty-six thousand, six hundred forty-seven".