678049279 has 2 divisors, whose sum is σ = 678049280. Its totient is φ = 678049278.

The previous prime is 678049249. The next prime is 678049283. The reversal of 678049279 is 972940876.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 678049279 - 2⁵ = 678049247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (678049249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339024639 + 339024640.

It is an arithmetic number, because the mean of its divisors is an integer number (339024640).

Almost surely, 2^678049279 is an apocalyptic number.

678049279 is a deficient number, since it is larger than the sum of its proper divisors (1).

678049279 is an equidigital number, since it uses as much as digits as its factorization.

678049279 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1524096, while the sum is 52.

The square root of 678049279 is about 26039.3793896859. The cubic root of 678049279 is about 878.5242478930.

The spelling of 678049279 in words is "six hundred seventy-eight million, forty-nine thousand, two hundred seventy-nine".