678438741 has 4 divisors (see below), whose sum is σ = 904584992. Its totient is φ = 452292492.

The previous prime is 678438727. The next prime is 678438773. The reversal of 678438741 is 147834876.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 678438741 - 2¹⁹ = 677914453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678438701) 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 3 ways as a sum of consecutive naturals, for example, 113073121 + ... + 113073126.

It is an arithmetic number, because the mean of its divisors is an integer number (226146248).

Almost surely, 2^678438741 is an apocalyptic number.

It is an amenable number.

678438741 is a deficient number, since it is larger than the sum of its proper divisors (226146251).

678438741 is a wasteful number, since it uses less digits than its factorization.

678438741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226146250.

The product of its digits is 903168, while the sum is 48.

The square root of 678438741 is about 26046.8566433649. The cubic root of 678438741 is about 878.6924197025.

The spelling of 678438741 in words is "six hundred seventy-eight million, four hundred thirty-eight thousand, seven hundred forty-one".