678011 has 4 divisors (see below), whose sum is σ = 717912. Its totient is φ = 638112.

The previous prime is 677983. The next prime is 678023. The reversal of 678011 is 110876.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 678011 - 2⁶ = 677947 is a prime.

It is a super-2 number, since 2×678011² = 919397832242, which contains 22 as substring.

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 pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19925 + ... + 19958.

It is an arithmetic number, because the mean of its divisors is an integer number (179478).

2⁶⁷⁸⁰¹¹ is an apocalyptic number.

678011 is a deficient number, since it is larger than the sum of its proper divisors (39901).

678011 is a wasteful number, since it uses less digits than its factorization.

678011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39900.

The product of its (nonzero) digits is 336, while the sum is 23.

The square root of 678011 is about 823.4142335423. The cubic root of 678011 is about 87.8507715337.

Adding to 678011 its reverse (110876), we get a palindrome (788887).

The spelling of 678011 in words is "six hundred seventy-eight thousand, eleven".