678427440 has 80 divisors (see below), whose sum is σ = 2105865216. Its totient is φ = 180678400.

The previous prime is 678427429. The next prime is 678427441. The reversal of 678427440 is 44724876.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 678427392 and 678427401.

It is not an unprimeable number, because it can be changed into a prime (678427441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 260545 + ... + 263135.

Almost surely, 2^678427440 is an apocalyptic number.

678427440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

678427440 is an abundant number, since it is smaller than the sum of its proper divisors (1427437776).

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

678427440 is a wasteful number, since it uses less digits than its factorization.

678427440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3698 (or 3692 counting only the distinct ones).

The product of its (nonzero) digits is 301056, while the sum is 42.

The square root of 678427440 is about 26046.6397064957. The cubic root of 678427440 is about 878.6875407760.

The spelling of 678427440 in words is "six hundred seventy-eight million, four hundred twenty-seven thousand, four hundred forty".