678364989 has 4 divisors (see below), whose sum is σ = 904486656. Its totient is φ = 452243324.

The previous prime is 678364943. The next prime is 678365003. The reversal of 678364989 is 989463876.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 678364989 - 2¹⁹ = 677840701 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678360989) 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, 113060829 + ... + 113060834.

It is an arithmetic number, because the mean of its divisors is an integer number (226121664).

Almost surely, 2^678364989 is an apocalyptic number.

It is an amenable number.

678364989 is a deficient number, since it is larger than the sum of its proper divisors (226121667).

678364989 is a wasteful number, since it uses less digits than its factorization.

678364989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226121666.

The product of its digits is 15676416, while the sum is 60.

The square root of 678364989 is about 26045.4408486399. The cubic root of 678364989 is about 878.6605781287.

The spelling of 678364989 in words is "six hundred seventy-eight million, three hundred sixty-four thousand, nine hundred eighty-nine".