678693720 has 128 divisors (see below), whose sum is σ = 2163594240. Its totient is φ = 169728000.

The previous prime is 678693667. The next prime is 678693721. The reversal of 678693720 is 27396876.

It is a self number, because there is not a number n which added to its sum of digits gives 678693720.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678693721) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 903345 + ... + 904095.

It is an arithmetic number, because the mean of its divisors is an integer number (16903080).

Almost surely, 2^678693720 is an apocalyptic number.

678693720 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 678693720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1081797120).

678693720 is an abundant number, since it is smaller than the sum of its proper divisors (1484900520).

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

678693720 is a wasteful number, since it uses less digits than its factorization.

678693720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1225 (or 1221 counting only the distinct ones).

The product of its (nonzero) digits is 762048, while the sum is 48.

The square root of 678693720 is about 26051.7508048883. The cubic root of 678693720 is about 878.8024861627.

The spelling of 678693720 in words is "six hundred seventy-eight million, six hundred ninety-three thousand, seven hundred twenty".