244640647 has 2 divisors, whose sum is σ = 244640648. Its totient is φ = 244640646.

The previous prime is 244640611. The next prime is 244640663. The reversal of 244640647 is 746046442.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 244640647 - 2⁷ = 244640519 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (244640147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122320323 + 122320324.

It is an arithmetic number, because the mean of its divisors is an integer number (122320324).

Almost surely, 2^244640647 is an apocalyptic number.

244640647 is a deficient number, since it is larger than the sum of its proper divisors (1).

244640647 is an equidigital number, since it uses as much as digits as its factorization.

244640647 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 129024, while the sum is 37.

The square root of 244640647 is about 15640.9925196581. The cubic root of 244640647 is about 625.4263944743.

The spelling of 244640647 in words is "two hundred forty-four million, six hundred forty thousand, six hundred forty-seven".