678440371 has 8 divisors (see below), whose sum is σ = 775551744. Its totient is φ = 581376840.

The previous prime is 678440341. The next prime is 678440377. The reversal of 678440371 is 173044876.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 678440371 - 2¹¹ = 678438323 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (678440377) 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, 26826 + ... + 45568.

It is an arithmetic number, because the mean of its divisors is an integer number (96943968).

Almost surely, 2^678440371 is an apocalyptic number.

678440371 is a deficient number, since it is larger than the sum of its proper divisors (97111373).

678440371 is a wasteful number, since it uses less digits than its factorization.

678440371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23921.

The product of its (nonzero) digits is 112896, while the sum is 40.

The square root of 678440371 is about 26046.8879331102. The cubic root of 678440371 is about 878.6931234101.

The spelling of 678440371 in words is "six hundred seventy-eight million, four hundred forty thousand, three hundred seventy-one".