678261 has 4 divisors (see below), whose sum is σ = 904352. Its totient is φ = 452172.

The previous prime is 678253. The next prime is 678289. The reversal of 678261 is 162876.

It is a happy number.

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 678261 - 2³ = 678253 is a prime.

It is a D-number.

It is a Duffinian number.

678261 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678211) 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, 113041 + ... + 113046.

It is an arithmetic number, because the mean of its divisors is an integer number (226088).

2⁶⁷⁸²⁶¹ is an apocalyptic number.

It is an amenable number.

678261 is a deficient number, since it is larger than the sum of its proper divisors (226091).

678261 is a wasteful number, since it uses less digits than its factorization.

678261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226090.

The product of its digits is 4032, while the sum is 30.

The square root of 678261 is about 823.5660264970. The cubic root of 678261 is about 87.8615678158.

It can be divided in two parts, 678 and 261, that added together give a palindrome (939).

The spelling of 678261 in words is "six hundred seventy-eight thousand, two hundred sixty-one".