678479865 has 16 divisors (see below), whose sum is σ = 1240649088. Its totient is φ = 310162176.

The previous prime is 678479819. The next prime is 678479869. The reversal of 678479865 is 568974876.

It is not a de Polignac number, because 678479865 - 2⁶ = 678479801 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 678479799 and 678479808.

It is not an unprimeable number, because it can be changed into a prime (678479869) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3230752 + ... + 3230961.

It is an arithmetic number, because the mean of its divisors is an integer number (77540568).

Almost surely, 2^678479865 is an apocalyptic number.

It is an amenable number.

678479865 is a deficient number, since it is larger than the sum of its proper divisors (562169223).

678479865 is a wasteful number, since it uses less digits than its factorization.

678479865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6461728.

The product of its digits is 20321280, while the sum is 60.

The square root of 678479865 is about 26047.6460548741. The cubic root of 678479865 is about 878.7101735122.

The spelling of 678479865 in words is "six hundred seventy-eight million, four hundred seventy-nine thousand, eight hundred sixty-five".