678950861 has 8 divisors (see below), whose sum is σ = 698696064. Its totient is φ = 659426560.

The previous prime is 678950843. The next prime is 678950891. The reversal of 678950861 is 168059876.

It is a happy number.

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-678950861 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678950891) 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, 48980 + ... + 61293.

It is an arithmetic number, because the mean of its divisors is an integer number (87337008).

Almost surely, 2^678950861 is an apocalyptic number.

It is an amenable number.

678950861 is a deficient number, since it is larger than the sum of its proper divisors (19745203).

678950861 is a wasteful number, since it uses less digits than its factorization.

678950861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110451.

The product of its (nonzero) digits is 725760, while the sum is 50.

The square root of 678950861 is about 26056.6855336591. The cubic root of 678950861 is about 878.9134579754.

The spelling of 678950861 in words is "six hundred seventy-eight million, nine hundred fifty thousand, eight hundred sixty-one".