678138696 has 64 divisors (see below), whose sum is σ = 1893595200. Its totient is φ = 224861184.

The previous prime is 678138689. The next prime is 678138707. The reversal of 678138696 is 696831876.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33555 + ... + 49821.

It is an arithmetic number, because the mean of its divisors is an integer number (29587425).

Almost surely, 2^678138696 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 678138696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (946797600).

678138696 is an abundant number, since it is smaller than the sum of its proper divisors (1215456504).

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

678138696 is a wasteful number, since it uses less digits than its factorization.

678138696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16475 (or 16465 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 54.

The square root of 678138696 is about 26041.0962902870. The cubic root of 678138696 is about 878.5628643340.

The spelling of 678138696 in words is "six hundred seventy-eight million, one hundred thirty-eight thousand, six hundred ninety-six".