678011838 has 16 divisors (see below), whose sum is σ = 1549741440. Its totient is φ = 193717656.

The previous prime is 678011777. The next prime is 678011839. The reversal of 678011838 is 838110876.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 16143139 = 678011838 / (6 + 7 + 8 + 0 + 1 + 1 + 8 + 3 + 8).

It is a self number, because there is not a number n which added to its sum of digits gives 678011838.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678011839) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8071528 + ... + 8071611.

It is an arithmetic number, because the mean of its divisors is an integer number (96858840).

Almost surely, 2^678011838 is an apocalyptic number.

678011838 is an abundant number, since it is smaller than the sum of its proper divisors (871729602).

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

678011838 is a wasteful number, since it uses less digits than its factorization.

678011838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16143151.

The product of its (nonzero) digits is 64512, while the sum is 42.

The square root of 678011838 is about 26038.6604494164. The cubic root of 678011838 is about 878.5080772730.

The spelling of 678011838 in words is "six hundred seventy-eight million, eleven thousand, eight hundred thirty-eight".