678568401 has 16 divisors (see below), whose sum is σ = 1148899200. Its totient is φ = 387753264.

The previous prime is 678568391. The next prime is 678568411. The reversal of 678568401 is 104865876.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (678568391) and next prime (678568411).

It is not a de Polignac number, because 678568401 - 2¹⁵ = 678535633 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (678568411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1794966 + ... + 1795343.

It is an arithmetic number, because the mean of its divisors is an integer number (71806200).

Almost surely, 2^678568401 is an apocalyptic number.

It is an amenable number.

678568401 is a deficient number, since it is larger than the sum of its proper divisors (470330799).

678568401 is a wasteful number, since it uses less digits than its factorization.

678568401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3590325 (or 3590319 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 45.

The square root of 678568401 is about 26049.3455004152. The cubic root of 678568401 is about 878.7483933151.

The spelling of 678568401 in words is "six hundred seventy-eight million, five hundred sixty-eight thousand, four hundred one".