678439950 has 24 divisors (see below), whose sum is σ = 1682531448. Its totient is φ = 180917280.

The previous prime is 678439921. The next prime is 678439963. The reversal of 678439950 is 59934876.

It is a junction number, because it is equal to n+sod(n) for n = 678439893 and 678439902.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2261317 + ... + 2261616.

It is an arithmetic number, because the mean of its divisors is an integer number (70105477).

Almost surely, 2^678439950 is an apocalyptic number.

678439950 is an abundant number, since it is smaller than the sum of its proper divisors (1004091498).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

678439950 is a wasteful number, since it uses less digits than its factorization.

678439950 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4522948 (or 4522943 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 51.

The square root of 678439950 is about 26046.8798515292. The cubic root of 678439950 is about 878.6929416550.

The spelling of 678439950 in words is "six hundred seventy-eight million, four hundred thirty-nine thousand, nine hundred fifty".