280406647 has 2 divisors, whose sum is σ = 280406648. Its totient is φ = 280406646.

The previous prime is 280406627. The next prime is 280406657. The reversal of 280406647 is 746604082.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 280406647 - 2²⁷ = 146188919 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (280406627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140203323 + 140203324.

It is an arithmetic number, because the mean of its divisors is an integer number (140203324).

Almost surely, 2^280406647 is an apocalyptic number.

280406647 is a deficient number, since it is larger than the sum of its proper divisors (1).

280406647 is an equidigital number, since it uses as much as digits as its factorization.

280406647 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64512, while the sum is 37.

The square root of 280406647 is about 16745.3470253680. The cubic root of 280406647 is about 654.5298158190.

The spelling of 280406647 in words is "two hundred eighty million, four hundred six thousand, six hundred forty-seven".