678041946 has 36 divisors (see below), whose sum is σ = 1510292862. Its totient is φ = 219687552.

The previous prime is 678041941. The next prime is 678041989. The reversal of 678041946 is 649140876.

It can be written as a sum of positive squares in 3 ways, for example, as 592386921 + 85655025 = 24339^2 + 9255^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (678041941) 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 17 ways as a sum of consecutive naturals, for example, 671490 + ... + 672498.

Almost surely, 2^678041946 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 678041946, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (755146431).

678041946 is an abundant number, since it is smaller than the sum of its proper divisors (832250916).

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

678041946 is a wasteful number, since it uses less digits than its factorization.

678041946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2063 (or 1051 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The square root of 678041946 is about 26039.2385833380. The cubic root of 678041946 is about 878.5210808461.

The spelling of 678041946 in words is "six hundred seventy-eight million, forty-one thousand, nine hundred forty-six".