678107640 has 128 divisors (see below), whose sum is σ = 2400030720. Its totient is φ = 149990400.

The previous prime is 678107579. The next prime is 678107653. The reversal of 678107640 is 46701876.

678107640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13020 + ... + 39060.

It is an arithmetic number, because the mean of its divisors is an integer number (18750240).

Almost surely, 2^678107640 is an apocalyptic number.

678107640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is a pronic number, being equal to 26040×26041.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 678107640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1200015360).

678107640 is an abundant number, since it is smaller than the sum of its proper divisors (1721923080).

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

678107640 is a wasteful number, since it uses less digits than its factorization.

678107640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26093 (or 26089 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 39.

The square root of 678107640 is about 26040.4999951998. The cubic root of 678107640 is about 878.5494525914.

The spelling of 678107640 in words is "six hundred seventy-eight million, one hundred seven thousand, six hundred forty".