678238705 has 8 divisors (see below), whose sum is σ = 814528512. Its totient is φ = 542162928.

The previous prime is 678238637. The next prime is 678238709. The reversal of 678238705 is 507832876.

678238705 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 678238705 - 2¹⁹ = 677714417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (678238709) 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, 46449 + ... + 59278.

It is an arithmetic number, because the mean of its divisors is an integer number (101816064).

Almost surely, 2^678238705 is an apocalyptic number.

It is an amenable number.

678238705 is a deficient number, since it is larger than the sum of its proper divisors (136289807).

678238705 is a wasteful number, since it uses less digits than its factorization.

678238705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107015.

The product of its (nonzero) digits is 564480, while the sum is 46.

The square root of 678238705 is about 26043.0164343534. The cubic root of 678238705 is about 878.6060511113.

The spelling of 678238705 in words is "six hundred seventy-eight million, two hundred thirty-eight thousand, seven hundred five".