678001 has 4 divisors (see below), whose sum is σ = 699904. Its totient is φ = 656100.

The previous prime is 677983. The next prime is 678023. The reversal of 678001 is 100876.

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 a 8-Lehmer number, since φ(678001) divides (678001-1)⁸.

It is a cyclic number.

It is not a de Polignac number, because 678001 - 2¹⁵ = 645233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (678061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10905 + ... + 10966.

It is an arithmetic number, because the mean of its divisors is an integer number (174976).

2⁶⁷⁸⁰⁰¹ is an apocalyptic number.

It is an amenable number.

678001 is a deficient number, since it is larger than the sum of its proper divisors (21903).

678001 is a wasteful number, since it uses less digits than its factorization.

678001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21902.

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 678001 is about 823.4081612420. The cubic root of 678001 is about 87.8503396272.

Adding to 678001 its reverse (100876), we get a palindrome (778877).

The spelling of 678001 in words is "six hundred seventy-eight thousand, one".