678964109 has 8 divisors (see below), whose sum is σ = 695995872. Its totient is φ = 661988880.

The previous prime is 678964103. The next prime is 678964127. The reversal of 678964109 is 901469876.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 678964109 - 2⁴ = 678964093 is a prime.

It is a super-2 number, since 2×678964109² = 921984522620327762, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678964103) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10727 + ... + 38379.

It is an arithmetic number, because the mean of its divisors is an integer number (86999484).

Almost surely, 2^678964109 is an apocalyptic number.

It is an amenable number.

678964109 is a deficient number, since it is larger than the sum of its proper divisors (17031763).

678964109 is a wasteful number, since it uses less digits than its factorization.

678964109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28267.

The product of its (nonzero) digits is 653184, while the sum is 50.

The square root of 678964109 is about 26056.9397474070. The cubic root of 678964109 is about 878.9191745255.

The spelling of 678964109 in words is "six hundred seventy-eight million, nine hundred sixty-four thousand, one hundred nine".