678656339 has 4 divisors (see below), whose sum is σ = 678739824. Its totient is φ = 678572856.

The previous prime is 678656327. The next prime is 678656351. The reversal of 678656339 is 933656876.

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

It is an interprime number because it is at equal distance from previous prime (678656327) and next prime (678656351).

It is a cyclic number.

It is not a de Polignac number, because 678656339 - 2¹² = 678652243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (678656369) 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, 28052 + ... + 46305.

It is an arithmetic number, because the mean of its divisors is an integer number (169684956).

Almost surely, 2^678656339 is an apocalyptic number.

678656339 is a deficient number, since it is larger than the sum of its proper divisors (83485).

678656339 is an equidigital number, since it uses as much as digits as its factorization.

678656339 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83484.

The product of its digits is 4898880, while the sum is 53.

The square root of 678656339 is about 26051.0333576233. The cubic root of 678656339 is about 878.7863516788.

The spelling of 678656339 in words is "six hundred seventy-eight million, six hundred fifty-six thousand, three hundred thirty-nine".