678662431 has 2 divisors, whose sum is σ = 678662432. Its totient is φ = 678662430.

The previous prime is 678662417. The next prime is 678662441. The reversal of 678662431 is 134266876.

678662431 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 678662431 - 2¹³ = 678654239 is a prime.

It is a super-2 number, since 2×678662431² = 921165390501659522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (678662401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339331215 + 339331216.

It is an arithmetic number, because the mean of its divisors is an integer number (339331216).

Almost surely, 2^678662431 is an apocalyptic number.

678662431 is a deficient number, since it is larger than the sum of its proper divisors (1).

678662431 is an equidigital number, since it uses as much as digits as its factorization.

678662431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 290304, while the sum is 43.

The square root of 678662431 is about 26051.1502817054. The cubic root of 678662431 is about 878.7889811640.

The spelling of 678662431 in words is "six hundred seventy-eight million, six hundred sixty-two thousand, four hundred thirty-one".