678715 has 4 divisors (see below), whose sum is σ = 814464. Its totient is φ = 542968.

The previous prime is 678659. The next prime is 678719. The reversal of 678715 is 517876.

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

It is a cyclic number.

It is not a de Polignac number, because 678715 - 2⁹ = 678203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (678719) 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, 67867 + ... + 67876.

It is an arithmetic number, because the mean of its divisors is an integer number (203616).

2⁶⁷⁸⁷¹⁵ is an apocalyptic number.

678715 is a deficient number, since it is larger than the sum of its proper divisors (135749).

678715 is a wasteful number, since it uses less digits than its factorization.

678715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135748.

The product of its digits is 11760, while the sum is 34.

The square root of 678715 is about 823.8416109909. The cubic root of 678715 is about 87.8811670827.

It can be divided in two parts, 67871 and 5, that added together give a palindrome (67876).

The spelling of 678715 in words is "six hundred seventy-eight thousand, seven hundred fifteen".