678778992 has 60 divisors (see below), whose sum is σ = 2011389120. Its totient is φ = 212949504.

The previous prime is 678778973. The next prime is 678779021. The reversal of 678778992 is 299877876.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 136192 + ... + 141087.

It is an arithmetic number, because the mean of its divisors is an integer number (33523152).

Almost surely, 2^678778992 is an apocalyptic number.

It is an amenable number.

678778992 is an abundant number, since it is smaller than the sum of its proper divisors (1332610128).

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

678778992 is a wasteful number, since it uses less digits than its factorization.

678778992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277310 (or 277301 counting only the distinct ones).

The product of its digits is 21337344, while the sum is 63.

The square root of 678778992 is about 26053.3873421480. The cubic root of 678778992 is about 878.8392892671.

The spelling of 678778992 in words is "six hundred seventy-eight million, seven hundred seventy-eight thousand, nine hundred ninety-two".