678515656 has 64 divisors (see below), whose sum is σ = 1575463680. Its totient is φ = 266768640.

The previous prime is 678515623. The next prime is 678515681. The reversal of 678515656 is 656515876.

It is a super-2 number, since 2×678515656² = 920766990874220672, which contains 22 as substring.

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, 118786 + ... + 124366.

It is an arithmetic number, because the mean of its divisors is an integer number (24616620).

Almost surely, 2^678515656 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 678515656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (787731840).

678515656 is an abundant number, since it is smaller than the sum of its proper divisors (896948024).

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

678515656 is a wasteful number, since it uses less digits than its factorization.

678515656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5774 (or 5770 counting only the distinct ones).

The product of its digits is 1512000, while the sum is 49.

The square root of 678515656 is about 26048.3330752661. Note that the first 3 decimals coincide. The cubic root of 678515656 is about 878.7256244069.

The spelling of 678515656 in words is "six hundred seventy-eight million, five hundred fifteen thousand, six hundred fifty-six".