678187090 has 32 divisors (see below), whose sum is σ = 1402861824. Its totient is φ = 231232320.

The previous prime is 678187073. The next prime is 678187129. The reversal of 678187090 is 90781876.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an alternating number because its digits alternate between even and odd.

It is a self number, because there is not a number n which added to its sum of digits gives 678187090.

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 15 ways as a sum of consecutive naturals, for example, 14094 + ... + 39433.

It is an arithmetic number, because the mean of its divisors is an integer number (43839432).

Almost surely, 2^678187090 is an apocalyptic number.

678187090 is an abundant number, since it is smaller than the sum of its proper divisors (724674734).

678187090 is a wasteful number, since it uses less digits than its factorization.

678187090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53722.

The product of its (nonzero) digits is 169344, while the sum is 46.

The square root of 678187090 is about 26042.0254588617. The cubic root of 678187090 is about 878.5837627923.

The spelling of 678187090 in words is "six hundred seventy-eight million, one hundred eighty-seven thousand, ninety".