678993078 has 16 divisors (see below), whose sum is σ = 1362273840. Its totient is φ = 225616416.

The previous prime is 678993059. The next prime is 678993079. The reversal of 678993078 is 870399876.

678993078 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×678993078² = 922063199943828168, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678993079) 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, 176593 + ... + 180396.

It is an arithmetic number, because the mean of its divisors is an integer number (85142115).

Almost surely, 2^678993078 is an apocalyptic number.

678993078 is an abundant number, since it is smaller than the sum of its proper divisors (683280762).

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

678993078 is a wasteful number, since it uses less digits than its factorization.

678993078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357311.

The product of its (nonzero) digits is 4572288, while the sum is 57.

The square root of 678993078 is about 26057.4956202625. The cubic root of 678993078 is about 878.9316744731.

The spelling of 678993078 in words is "six hundred seventy-eight million, nine hundred ninety-three thousand, seventy-eight".