678908947 has 4 divisors (see below), whose sum is σ = 685500400. Its totient is φ = 672317496.

The previous prime is 678908911. The next prime is 678908953. The reversal of 678908947 is 749809876.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 678908947 - 2¹⁵ = 678876179 is a prime.

It is a super-3 number, since 3×678908947³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 678908891 and 678908900.

It is not an unprimeable number, because it can be changed into a prime (678908047) 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, 3295572 + ... + 3295777.

It is an arithmetic number, because the mean of its divisors is an integer number (171375100).

Almost surely, 2^678908947 is an apocalyptic number.

678908947 is a deficient number, since it is larger than the sum of its proper divisors (6591453).

678908947 is a wasteful number, since it uses less digits than its factorization.

678908947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6591452.

The product of its (nonzero) digits is 6096384, while the sum is 58.

The square root of 678908947 is about 26055.8812362967. The cubic root of 678908947 is about 878.8953714742.

The spelling of 678908947 in words is "six hundred seventy-eight million, nine hundred eight thousand, nine hundred forty-seven".