678456726 has 16 divisors (see below), whose sum is σ = 1357171200. Its totient is φ = 226109288.

The previous prime is 678456721. The next prime is 678456841. The reversal of 678456726 is 627654876.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678456721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49315 + ... + 61553.

It is an arithmetic number, because the mean of its divisors is an integer number (84823200).

Almost surely, 2^678456726 is an apocalyptic number.

678456726 is an abundant number, since it is smaller than the sum of its proper divisors (678714474).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

678456726 is a wasteful number, since it uses less digits than its factorization.

678456726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21483.

The product of its digits is 3386880, while the sum is 51.

The square root of 678456726 is about 26047.2018842716. The cubic root of 678456726 is about 878.7001841684.

The spelling of 678456726 in words is "six hundred seventy-eight million, four hundred fifty-six thousand, seven hundred twenty-six".