678724739 has 8 divisors (see below), whose sum is σ = 846202368. Its totient is φ = 528876360.

The previous prime is 678724721. The next prime is 678724751. The reversal of 678724739 is 937427876.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 678724739 - 2⁸ = 678724483 is a prime.

It is not an unprimeable number, because it can be changed into a prime (678724759) 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 7 ways as a sum of consecutive naturals, for example, 4407227 + ... + 4407380.

It is an arithmetic number, because the mean of its divisors is an integer number (105775296).

Almost surely, 2^678724739 is an apocalyptic number.

678724739 is a deficient number, since it is larger than the sum of its proper divisors (167477629).

678724739 is a wasteful number, since it uses less digits than its factorization.

678724739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8814625.

The product of its digits is 3556224, while the sum is 53.

The square root of 678724739 is about 26052.3461323544. The cubic root of 678724739 is about 878.8158742141.

The spelling of 678724739 in words is "six hundred seventy-eight million, seven hundred twenty-four thousand, seven hundred thirty-nine".