678322720 has 24 divisors (see below), whose sum is σ = 1602537804. Its totient is φ = 271329024.

The previous prime is 678322691. The next prime is 678322741. The reversal of 678322720 is 27223876.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 611671824 + 66650896 = 24732^2 + 8164^2 .

It is a super-3 number, since 3×678322720³ (a number of 27 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 678322720.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2119599 + ... + 2119918.

Almost surely, 2^678322720 is an apocalyptic number.

It is an amenable number.

678322720 is an abundant number, since it is smaller than the sum of its proper divisors (924215084).

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

678322720 is a wasteful number, since it uses less digits than its factorization.

678322720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4239532 (or 4239524 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 37.

The square root of 678322720 is about 26044.6293888011. The cubic root of 678322720 is about 878.6423279359.

The spelling of 678322720 in words is "six hundred seventy-eight million, three hundred twenty-two thousand, seven hundred twenty".