678340529 has 8 divisors (see below), whose sum is σ = 685348800. Its totient is φ = 671365296.

The previous prime is 678340501. The next prime is 678340549. The reversal of 678340529 is 925043876.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-678340529 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 678340529.

It is not an unprimeable number, because it can be changed into a prime (678340549) 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, 34124 + ... + 50210.

It is an arithmetic number, because the mean of its divisors is an integer number (85668600).

Almost surely, 2^678340529 is an apocalyptic number.

It is an amenable number.

678340529 is a deficient number, since it is larger than the sum of its proper divisors (7008271).

678340529 is a wasteful number, since it uses less digits than its factorization.

678340529 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16519.

The product of its (nonzero) digits is 362880, while the sum is 44.

The square root of 678340529 is about 26044.9712804603. The cubic root of 678340529 is about 878.6500172966.

The spelling of 678340529 in words is "six hundred seventy-eight million, three hundred forty thousand, five hundred twenty-nine".