2780647 has 2 divisors, whose sum is σ = 2780648. Its totient is φ = 2780646.

The previous prime is 2780641. The next prime is 2780671. The reversal of 2780647 is 7460872.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2780647 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2780641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1390323 + 1390324.

It is an arithmetic number, because the mean of its divisors is an integer number (1390324).

2^2780647 is an apocalyptic number.

2780647 is a deficient number, since it is larger than the sum of its proper divisors (1).

2780647 is an equidigital number, since it uses as much as digits as its factorization.

2780647 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18816, while the sum is 34.

The square root of 2780647 is about 1667.5272111723. The cubic root of 2780647 is about 140.6204941437.

The spelling of 2780647 in words is "two million, seven hundred eighty thousand, six hundred forty-seven".