678593394 has 48 divisors (see below), whose sum is σ = 1516850712. Its totient is φ = 219089664.

The previous prime is 678593393. The next prime is 678593411. The reversal of 678593394 is 493395876.

It can be written as a sum of positive squares in 4 ways, for example, as 624350169 + 54243225 = 24987^2 + 7365^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 678593394.

It is not an unprimeable number, because it can be changed into a prime (678593393) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 152992 + ... + 157364.

Almost surely, 2^678593394 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 678593394, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (758425356).

678593394 is an abundant number, since it is smaller than the sum of its proper divisors (838257318).

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

678593394 is a wasteful number, since it uses less digits than its factorization.

678593394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4651 (or 4648 counting only the distinct ones).

The product of its digits is 4898880, while the sum is 54.

The square root of 678593394 is about 26049.8252201430. The cubic root of 678593394 is about 878.7591818561.

It can be divided in two parts, 67859 and 3394, that added together give a triangular number (71253 = T₃₇₇).

The spelling of 678593394 in words is "six hundred seventy-eight million, five hundred ninety-three thousand, three hundred ninety-four".