678242399 has 2 divisors, whose sum is σ = 678242400. Its totient is φ = 678242398.

The previous prime is 678242393. The next prime is 678242417. The reversal of 678242399 is 993242876.

678242399 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 678242399 - 2⁸ = 678242143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (678242393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339121199 + 339121200.

It is an arithmetic number, because the mean of its divisors is an integer number (339121200).

Almost surely, 2^678242399 is an apocalyptic number.

678242399 is a deficient number, since it is larger than the sum of its proper divisors (1).

678242399 is an equidigital number, since it uses as much as digits as its factorization.

678242399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1306368, while the sum is 50.

The square root of 678242399 is about 26043.0873553809. The cubic root of 678242399 is about 878.6076462060.

The spelling of 678242399 in words is "six hundred seventy-eight million, two hundred forty-two thousand, three hundred ninety-nine".