678564894 has 64 divisors (see below), whose sum is σ = 1657497600. Its totient is φ = 180776448.

The previous prime is 678564893. The next prime is 678564949. The reversal of 678564894 is 498465876.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678564893) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 73467 + ... + 82185.

It is an arithmetic number, because the mean of its divisors is an integer number (25898400).

Almost surely, 2^678564894 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 678564894, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (828748800).

678564894 is an abundant number, since it is smaller than the sum of its proper divisors (978932706).

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

678564894 is a wasteful number, since it uses less digits than its factorization.

678564894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8857.

The product of its digits is 11612160, while the sum is 57.

The square root of 678564894 is about 26049.2781857770. The cubic root of 678564894 is about 878.7468794535.

The spelling of 678564894 in words is "six hundred seventy-eight million, five hundred sixty-four thousand, eight hundred ninety-four".