678656340 has 192 divisors, whose sum is σ = 2214051840. Its totient is φ = 172368000.

The previous prime is 678656327. The next prime is 678656351. The reversal of 678656340 is 43656876.

678656340 is a `hidden beast` number, since 6 + 7 + 8 + 6 + 5 + 634 + 0 = 666.

678656340 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1188255 + ... + 1188825.

It is an arithmetic number, because the mean of its divisors is an integer number (11531520).

Almost surely, 2^678656340 is an apocalyptic number.

678656340 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 678656340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1107025920).

678656340 is an abundant number, since it is smaller than the sum of its proper divisors (1535395500).

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

678656340 is a wasteful number, since it uses less digits than its factorization.

678656340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 691 (or 683 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 45.

The square root of 678656340 is about 26051.0333768164. The cubic root of 678656340 is about 878.7863521104.

The spelling of 678656340 in words is "six hundred seventy-eight million, six hundred fifty-six thousand, three hundred forty".