678699684 has 144 divisors (see below), whose sum is σ = 1963386880. Its totient is φ = 195955200.

The previous prime is 678699683. The next prime is 678699689. The reversal of 678699684 is 486996876.

It is a super-2 number, since 2×678699684² = 921266522123399712, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (678699683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1128984 + ... + 1129584.

Almost surely, 2^678699684 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 678699684, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (981693440).

678699684 is an abundant number, since it is smaller than the sum of its proper divisors (1284687196).

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

678699684 is a wasteful number, since it uses less digits than its factorization.

678699684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 770 (or 765 counting only the distinct ones).

The product of its digits is 31352832, while the sum is 63.

The square root of 678699684 is about 26051.8652691127. The cubic root of 678699684 is about 878.8050603051.

It can be divided in two parts, 678699 and 684, that multiplied together give a square (464230116 = 21546²).

The spelling of 678699684 in words is "six hundred seventy-eight million, six hundred ninety-nine thousand, six hundred eighty-four".