678012040 has 32 divisors (see below), whose sum is σ = 1554315480. Its totient is φ = 266086912.

The previous prime is 678012031. The next prime is 678012047. The reversal of 678012040 is 40210876.

678012040 = T₃₂₉ + T₃₃₀ + ... + T₁₆₀₀.

It can be written as a sum of positive squares in 4 ways, for example, as 493106436 + 184905604 = 22206^2 + 13598^2 .

It is not an unprimeable number, because it can be changed into a prime (678012047) 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 7 ways as a sum of consecutive naturals, for example, 157789 + ... + 162028.

Almost surely, 2^678012040 is an apocalyptic number.

It is an amenable number.

678012040 is an abundant number, since it is smaller than the sum of its proper divisors (876303440).

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

678012040 is a wasteful number, since it uses less digits than its factorization.

678012040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319881 (or 319877 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 678012040 is about 26038.6643282638. The cubic root of 678012040 is about 878.5081645176.

The spelling of 678012040 in words is "six hundred seventy-eight million, twelve thousand, forty".