280616387 has 2 divisors, whose sum is σ = 280616388. Its totient is φ = 280616386.

The previous prime is 280616359. The next prime is 280616389. The reversal of 280616387 is 783616082.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 280616387 - 2²⁶ = 213507523 is a prime.

Together with 280616389, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_15257867 and since 280616387 and 15257867 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (280616389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140308193 + 140308194.

It is an arithmetic number, because the mean of its divisors is an integer number (140308194).

Almost surely, 2^280616387 is an apocalyptic number.

280616387 is a deficient number, since it is larger than the sum of its proper divisors (1).

280616387 is an equidigital number, since it uses as much as digits as its factorization.

280616387 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96768, while the sum is 41.

The square root of 280616387 is about 16751.6084899331. The cubic root of 280616387 is about 654.6929680019.

The spelling of 280616387 in words is "two hundred eighty million, six hundred sixteen thousand, three hundred eighty-seven".