278628671 has 2 divisors, whose sum is σ = 278628672. Its totient is φ = 278628670.

The previous prime is 278628583. The next prime is 278628703. The reversal of 278628671 is 176826872.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 278628671 - 2¹⁸ = 278366527 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (278688671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139314335 + 139314336.

It is an arithmetic number, because the mean of its divisors is an integer number (139314336).

Almost surely, 2^278628671 is an apocalyptic number.

278628671 is a deficient number, since it is larger than the sum of its proper divisors (1).

278628671 is an equidigital number, since it uses as much as digits as its factorization.

278628671 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 451584, while the sum is 47.

The square root of 278628671 is about 16692.1739446964. The cubic root of 278628671 is about 653.1434879530.

The spelling of 278628671 in words is "two hundred seventy-eight million, six hundred twenty-eight thousand, six hundred seventy-one".