678191874 has 32 divisors (see below), whose sum is σ = 1371129984. Its totient is φ = 223614720.

The previous prime is 678191851. The next prime is 678191881. The reversal of 678191874 is 478191876.

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, 637467 + ... + 638529.

It is an arithmetic number, because the mean of its divisors is an integer number (42847812).

Almost surely, 2^678191874 is an apocalyptic number.

678191874 is an abundant number, since it is smaller than the sum of its proper divisors (692938110).

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

678191874 is a wasteful number, since it uses less digits than its factorization.

678191874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2122.

The product of its digits is 677376, while the sum is 51.

The square root of 678191874 is about 26042.1173102342. The cubic root of 678191874 is about 878.5858286602.

The spelling of 678191874 in words is "six hundred seventy-eight million, one hundred ninety-one thousand, eight hundred seventy-four".