678928969 has 4 divisors (see below), whose sum is σ = 685651140. Its totient is φ = 672206800.

The previous prime is 678928951. The next prime is 678929039. The reversal of 678928969 is 969829876.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 302064400 + 376864569 = 17380^2 + 19413^2 .

It is a cyclic number.

It is not a de Polignac number, because 678928969 - 2⁵ = 678928937 is a prime.

It is a super-2 number, since 2×678928969² = 921889089894805922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 678928969.

It is not an unprimeable number, because it can be changed into a prime (678928169) 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, 3360934 + ... + 3361135.

It is an arithmetic number, because the mean of its divisors is an integer number (171412785).

Almost surely, 2^678928969 is an apocalyptic number.

It is an amenable number.

678928969 is a deficient number, since it is larger than the sum of its proper divisors (6722171).

678928969 is a wasteful number, since it uses less digits than its factorization.

678928969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6722170.

The product of its digits is 23514624, while the sum is 64.

The square root of 678928969 is about 26056.2654461456. The cubic root of 678928969 is about 878.9040113516.

The spelling of 678928969 in words is "six hundred seventy-eight million, nine hundred twenty-eight thousand, nine hundred sixty-nine".