678061511 has 4 divisors (see below), whose sum is σ = 678249792. Its totient is φ = 677873232.

The previous prime is 678061477. The next prime is 678061513. The reversal of 678061511 is 115160876.

678061511 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-678061511 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678061513) 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, 88631 + ... + 95976.

It is an arithmetic number, because the mean of its divisors is an integer number (169562448).

Almost surely, 2^678061511 is an apocalyptic number.

678061511 is a deficient number, since it is larger than the sum of its proper divisors (188281).

678061511 is a wasteful number, since it uses less digits than its factorization.

678061511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188280.

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 678061511 is about 26039.6142636561. The cubic root of 678061511 is about 878.5295307165.

The spelling of 678061511 in words is "six hundred seventy-eight million, sixty-one thousand, five hundred eleven".