280964639 has 2 divisors, whose sum is σ = 280964640. Its totient is φ = 280964638.

The previous prime is 280964633. The next prime is 280964653. The reversal of 280964639 is 936469082.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 280964639 - 2¹⁶ = 280899103 is a prime.

It is a super-2 number, since 2×280964639² = 157882256736800642, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 280964593 and 280964602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (280964633) 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 as a sum of consecutive naturals, namely, 140482319 + 140482320.

It is an arithmetic number, because the mean of its divisors is an integer number (140482320).

Almost surely, 2^280964639 is an apocalyptic number.

280964639 is a deficient number, since it is larger than the sum of its proper divisors (1).

280964639 is an equidigital number, since it uses as much as digits as its factorization.

280964639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 559872, while the sum is 47.

The square root of 280964639 is about 16761.9998508531. Note that the first 3 decimals coincide. The cubic root of 280964639 is about 654.9636861945.

The spelling of 280964639 in words is "two hundred eighty million, nine hundred sixty-four thousand, six hundred thirty-nine".