678943387 has 4 divisors (see below), whose sum is σ = 678996976. Its totient is φ = 678889800.

The previous prime is 678943381. The next prime is 678943423. The reversal of 678943387 is 783349876.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 678943387 - 2⁷ = 678943259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (678943381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4033 + ... + 37069.

It is an arithmetic number, because the mean of its divisors is an integer number (169749244).

Almost surely, 2^678943387 is an apocalyptic number.

678943387 is a deficient number, since it is larger than the sum of its proper divisors (53589).

678943387 is a wasteful number, since it uses less digits than its factorization.

678943387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53588.

The product of its digits is 6096384, while the sum is 55.

The square root of 678943387 is about 26056.5421151771. The cubic root of 678943387 is about 878.9102328901.

It can be divided in two parts, 6789 and 43387, that added together give a square (50176 = 224²).

The spelling of 678943387 in words is "six hundred seventy-eight million, nine hundred forty-three thousand, three hundred eighty-seven".