678979955 has 4 divisors (see below), whose sum is σ = 814775952. Its totient is φ = 543183960.

The previous prime is 678979937. The next prime is 678979993. The reversal of 678979955 is 559979876.

678979955 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 678979955 - 2⁸ = 678979699 is a prime.

It is a super-2 number, since 2×678979955² = 922027558583604050, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 678979891 and 678979900.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67897991 + ... + 67898000.

It is an arithmetic number, because the mean of its divisors is an integer number (203693988).

Almost surely, 2^678979955 is an apocalyptic number.

678979955 is a deficient number, since it is larger than the sum of its proper divisors (135795997).

678979955 is a wasteful number, since it uses less digits than its factorization.

678979955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135795996.

The product of its digits is 42865200, while the sum is 65.

The square root of 678979955 is about 26057.2438105031. The cubic root of 678979955 is about 878.9260120224.

The spelling of 678979955 in words is "six hundred seventy-eight million, nine hundred seventy-nine thousand, nine hundred fifty-five".